Friday, November 30, 2007

History about Orkut

Orkut

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Orkut
Image:Orkut logo.gif
URL http://www.orkut.com/
Type of site Social Network Service
Owner Google
Created by Orkut Büyükkökten
Launched January 2004
Current status Active

Orkut is an Internet social network service run by Google and named after its creator, Google employee Orkut Büyükkökten. It claims to be designed to help users meet new friends and maintain existing relationships. Similar to Facebook, Friendster and MySpace, Orkut goes a step further by permitting the creation of easy-to-set-up simple forums (called "communities") of users. Since October 2006, Orkut has permitted users to create accounts without an invitation. In April 2007, Orkut introduced polls in communities.

The initial target market for Orkut was the United States, but the majority of its users are in Brazil.[1] In fact, as of November 2007, 62.9% of the traffic come from Brazil, followed by 19.2% from India.[2]

Contents

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[edit] History

Orkut was launched in January 2004 by the search company Google, the brainchild of Orkut Büykökten, a Turkish software engineer, who developed it as an independent project while working at Google. In late June 2004, Affinity Engines filed suit against Google, claiming that Orkut Büyükkökten and Google based Orkut on inCircle code. Originally, its membership was by invitation only. At the end of July 2004, Orkut's membership surpassed 1 million accounts, and by the following September, it had surpassed 2 million accounts. In October 2006, Orkut stated to have 37 million accounts and 1.3 million daily visitors.[3] As of August 2007, the service claimed 67 million users.

[edit] Features

A user first creates a "Profile", in which the user provides "Social", "Professional" and "Personal" details and determining who is allowed to view certain details. Users can also associate images with their profiles.

[edit] Scrapbook

"Scrapping" is popular among the Orkut community as a form of offline communication. Users can "scrap" on another member's scrapbook, even if that member is offline. The scrap recipient will be able to see it when viewing their scrapbook. Unlike instant messaging or e-mail, anyone with an Orkut account can read other users' scrapbook entries. Scraps can also use HTML to embed files, including photos, videos and audio, into other users' scrapbooks.

[edit] Communities

Another feature of Orkut are "Communities". Anyone with an Orkut account can create a community on anything. One can post topics, inform users about an event, ask them questions or just play games. There are more than one million communities on Orkut with topics ranging from pizza to pasta or from film star to superstar. The first five communities on Orkut were started within 24 hrs of the site's launch. Users can upload photos into their Orkut profile with a caption. Users can also add videos to their profile from either YouTube or Google Videos with the additional option of creating either restricted or un-restricted polls for polling a community of users.

[edit] Personal Messaging

In addition to this, there is a personal messaging feature which is rarely used by members.[citation needed] It is mainly used by community owners to ask others to join their community. One issue of this feature is that it lacks confidentiality,[citation needed] owing to the reason that if you know the exact link of the message then you can read such messages.

[edit] Other Miscellaneous Features

Users have options to rate their friends in the order of "Best Friends", "Good Friends", "Friends", "Acquaintances" and "Haven't met". Further, each member can become fans of any of the friends in their list and can also evaluate whether their friend is "Trustworthy", "Cool", "Sexy" on a scale of 1 to 3 (marked by icons) and is aggregated in terms of a percentage. Unlike Facebook, where a member can view profile details of people only on their network, Orkut allows anyone to visit anyone's profile, unless a potential visitor is on your "Ignore List". Importantly, each member can also customize their profile preferences and can restrict information that appear on their profile from their friends and/or others (not on the friends list). The highlight feature is where any member can add any other member on Orkut to his/her "Crush List" and both of them will be informed only when both parties have added each other to their "Crush List".

When a user logs in, they see the people in their friends list in the order of their logging in to the site, the first person being the latest one to do so[citation needed]. Orkut's competitors are other social networking sites including MySpace and Facebook. Ning is a more direct competitor, as they allow creation of Social Networks which are similar to Orkut's communities.

[edit] Orkut Redesign

The new Orkut interface
The new Orkut interface

On Friday, August 24, 2007, Orkut announced a redesign. The new UI contains round corners and soft colors including small logotype at upper left corner. The redesign has been announced on the official Orkut Blog.

By Thursday, August 30, 2007, most users on Orkut could see changes on their profile pages as per the new redesign. On the 31st, Orkut announced its new features including improvements to the way you view your friends, 9 rather than 8 of your friends displayed on your homepage and profile page and basic links to your friends' content right under their profile picture as you browse through their different pages. It also announced the initial release of Orkut in 5 new languages: Hindi, Bengali, Marathi, Tamil, and Telugu. Profile editing can take place by clicking the settings button under your profile photo (or alternatively, click the blue settings link at the top of any page).

On September 4, 2007, Orkut announced another new feature. You can now see an "Updates from your friends" box on the homepage, where you'll get real-time updates when your friends make changes to their profiles, photos and videos. Moreover, in case you want to keep some things on your profile private, Orkut has added an easy opt-out button on the settings page.

On November 8, 2007, Orkut greeted its Indian users Happy Diwali in a very special way, by allowing them to change their Orkut look to a Diwali-flavored reddish theme.[4]

[edit] Criticism

[edit] Flooders and fake profiles

As with any online social networking community, a number of fake and cloned profiles exist on Orkut.[5] Due to the large number of users, and the deactivation of the jail system, the profiles were often left unremoved or, when removed, recreated easily. These profiles are normally created to troll, to spam, to flood or just for fun. It isn't hard to find users owning more than one profile, with some stating they own hundreds. Also, many of the users use these profiles to steal art that has previously posted online and deem it their own.[citation needed]

In 2005 invisible profiles, communities and topics started to appear in Orkut. This could be achieved by using HTML escaping codes and 1x1 pixel photos to fool the engine behind the site.[6]

In the August 2005 a freeware program made in Delphi called Floodtudo ("tudo" in Portuguese means "everything" - this was developed by a Brazilian) specifically for flooding Orkut. It quickly spread through the users and was easily downloadable (the most common Floodtudo versions were 1.2, 1.5, 2.0 and 2.2). As this program was massively used by thousands of spammers, a big spam wave struck Orkut in September and October 2005. However, changes implemented by the developers in November made this program non-functional.[citation needed]

As the flooding of Orkut was getting out of control, the developers implemented some features in order to stop this, such as not allowing two or more verbatim topics or scrapbook entries to be submitted, forcing the user to wait before posting another topic or scrapbook entry, and the usage of captchas, whenever a scrap entry has a hyperlink. They gave more rights to community moderators as well, so that they can just ban users instead of relying on the developers to remove them, and now community moderators are able to mass-delete posts too.[citation needed]

[edit] Hate groups

There has recently been controversy revolving around the use of Orkut by various hate groups. Virulent racists allegedly have a solid following there. Several hate communities focused on racism, Nazism and white supremacy have been deleted due to guideline violation. However, the number of these communities and profiles has not stopped growing because they can be very easily created and it is hard for Orkut to check them[citation needed].

In 2005, various cases of racism were denounced to police and reported in the Brazilian media.[citation needed] In 2006, a judicial measure was opened by the Brazil federal justice denouncing a 20-year-old student accused of racism against those of African ancestry and spreading defamatory content on Orkut.[7]. Brazilian Federal Justice subpoenaed Google on March 2006 to explain the crimes that had occurred in Orkut.[8]

Anti-religion, anti-national, and anti-ethnic hate groups have also been spotted. Recently an Indian court has issued notices to Google on some of the groups. The Mumbai Police too is seeking a ban on Orkut post objections raised by political groups. Groups denigrating various political leaders and celebrities have also emerged.

[edit] State Censorship

Orkut was very popular in Iran, but the website is now blocked by the government. As they say, this is due to national security issues, and ethical Islamic issues about dating and match making. To get around this block, sites such as orkutproxy.com (now defunct) were made for Iranian users. Other websites such as Yahoo! Groups and Google Groups have communities dedicated to receiving updates on the newest location of Iran's Orkut proxy. Though it was once possible to bypass governmental blockage of Orkut, the site has closed its HTTPS pages on all anonymous proxies. Now it is almost impossible for ordinary users to visit this site inside Iran.[neutrality disputed] Also many sites have been published since Orkut's blockade in Iran following the same path such as MyPardis, Cloob or Banhaneh. Of course these websites deal with a high degree of risk to get filtered too, so they have their own censorship policies to meet Iran's un-written regulations and rules of filtering.

In August 2006, United Arab Emirates followed the footsteps of Iran in blocking the site. This block was subsequently removed in October 2006. On July 3, 2007, Gulf News revisited the issue, publishing complaints from members of the public against Orkut communities like "Dubai Sex", and officially bringing the complaints to the attention of the state telecom monopoly Etisalat [2]. The ensuing moral panic resulted in a renewed ban of the site by Etisalat by July 4, 2007 [3], still in effect despite Google's promise to negotiate the ban with the UAE [4]. Saudi Arabia is another country that has blocked access to Orkut, while Bahrain's information ministry is also under pressure to follow suit [5].

[edit] Security and safety

[edit] Hacking accounts and communities with XSS

In 2005 dozens of communities' ownership was hacked by a Computer Security expert known as Shamsher Terror to demonstrate the undiscovered security vulnerabilities. A similar feat was performed by a Brazilian hacker called Vinícius K-Max , using a cross-site scripting (XSS) vulnerability. Eventually, various phishing sites were developed with the intent of stealing other people's accounts and communities.

[edit] MW.Orc worm

On June 19, 2006 FaceTime Security Labs' security researchers Christopher Boyd and Wayne Porter discovered a worm, dubbed MW.Orc.[9]

The worm steals users' banking details, usernames and passwords by propagating through Orkut. The attack was triggered as users launched an executable file disguised as a JPEG file. The initial executable file that causes the infection installs two additional files on the user's computer. These files then e-mail banking details and passwords to the worm's anonymous creator when infected users click on the "My Computer" icon.

The infection spreads automatically by posting a URL in another user's Orkut Scrapbook, a guestbook where visitors can leave comments visible on the user's page. This link lures visitors with a message in Portuguese, falsely claiming to offer additional photos. The message text that carries an infection link can vary from case to case.

In addition to stealing personal information, the malware can also enable a remote user to control the PC and make it part of a botnet, a network of infected PCs. The botnet in this case uses an infected PC's bandwidth to distribute large, pirated movie files, potentially slowing down an end-user's connection speed.

The initial executable file (Minhasfotos.exe) creates two additional files when activated, winlogon_.jpg and wzip32.exe (located in the System32 Folder). When the user clicks the "My Computer" icon, a mail is sent containing their personal data. In addition, they may be added to an XDCC Botnet (used for file sharing), and the infection link may be sent to other users that they know in the Orkut network. The infection can be spread manually, but also has the ability to send "back dated" infection links to people in the "friends list" of the infected user.

According to statements made by Google, as noted in Facetime's Greynets Blog the company had implemented a temporary fix for the dangerous worm.[9]

[edit] HTTPS Not Obvious

In and around April 17, 2007 users began reporting that secure (https) access to the Orkut login server was no longer available. This led some users to cancel their accounts, fearing potential abuse of their Orkut and related Google accounts, such as Gmail.

In fact, Google had changed the main login page to http delivery to improve efficiency, but the actual login remained secure using https in an iframe [6]. This information has not been well-published by Google, and does not give the users the reassurance of seeing the "secure connection" padlock in the browser. On July 17, 2007, a revised login page, which is delivered via https, addressed these issues.

[edit] Session Management and Authentication Issues

On June 22, 2007 Susam Pal and Vipul Agarwal published a security advisory on Orkut vulnerabilities related to authentication issues. [10] The vulnerablities are considered very dangerous in cybercafes, or in the case of man-in-the-middle attack as they can lead to session hijacking and misuse of legitimate accounts. [11] The vulnerabilities are not known to be fixed yet and therefore pose threat to the Orkut users.

A week later, on June 29, 2007 Susam Pal published another security advisory which described how the Orkut authentication issue can be exploited to hijack Google and GMail sessions and misuse the compromised account of a legitimate user under certain conditions.

Joseph Hick performed an experiment on the basis of the advisories published by Susam Pal, to find out how long a session remains alive even after a user logs out. [12] His experiment confirmed that the sessions remain alive for 14 days after the user has logged out. It implies that a hijacked session can be used for 14 days by the hijacker because logging out does not kill the session. [13]

[edit] Orkut Help

[edit] Help Center

To resolve users queries and help them on a one click.The orkut have well setup and uptodate help topics in orkut help center Where users can find answers for their questions in addition to this help center

[edit] Help Group

There is another official Help group.User can ask,report their problem and get update from help group, also they can suggest new features. This group is running by orkut users. i.e help to each other. With help from orkut officials.

[edit] Legal Issues

[edit] Brazil

On August 22, 2006, Brazilian Federal Judge José Marcos Lunardelli ordered Google to release Orkut user’s information of a list of about two dozen Brazilian nationals, believed to be using Orkut to sell drugs and involved in child pornography by September 28. The judge ordered Google to pay $23,000 per day in fines until the information is turned over to the Brazilian government. The information the government is requesting would also be used to identify individuals that are spreading child pornography and hate speech, according to the Brazilian government. As of September 27, 2006 Google has stated that they will not release the information, on the grounds that the requested information is on Google servers in the U.S. and not Google servers in Brazil, and is therefore not subject to Brazilian laws.

[edit] India

Of late, the number of Indians on Orkut has been increasing rapidly. On October 10, 2006, the Bombay High Court's Aurangabad bench served a notice on Google for allowing a hate campaign against India.[14] This referred to a community on Orkut called 'We Hate India', which initially carried a picture of an Indian flag being burned and some anti-India content.[15]

The High Court order was issued in response to a public-interest petition filed by an Aurangabad advocate. Google had six weeks to respond. Even before the petition was filed, many Orkut users had noticed this community and were mailing or otherwise messaging their contacts on Orkut[citation needed] to report the community as bogus to Google, which could result in its removal. The community continues to exist and had spawned several 'We hate those who hate India' communities.

Prior to the 60th Independence Day of India, orkut's main page was revamped. The section which usually displayed a collage of photos of various people, showed a stylized orkut logo. The word orkut was written in the Devanagiri script and was colored in the Indian national colours. Clicking on the logo redirects to a post by the orkut India Product Manager, Manu Rekhi,[16] on the orkut internal blog. There has also been some media outcry against Orkut after a couple of youngsters were apparently lured by fake profiles on the site and later murdered.[17]

On November 23, Bombay High Court asked the state government to file its reply in connection with a petition demanding a ban on social networking site, Orkut, for hosting an anti-Shivaji Web community.[18]

Recently, the Pune rural police cracked a rave party which is illegal in India.[19] The accused have been charged under anti-narcotic laws, the (Indian) Narcotic Drugs and Psychotropics Substances Act, 1985 (NDPS). Besides the NDPS, according to some media reports, the police were deliberating on the issue of charging the accused under the (Indian) Information Technology Act, 2000 perhaps because Orkut was believed to be one of the mode of communication for these kind of drug abuses.[20]

Thursday, November 29, 2007

Earthquakes, Mars

91. What is the highest, driest, and coldest continent on Earth?

That would be Antarctica.

92. At what depth do most earthquakes occur?

Most are triggered less than 50 miles (80 kilometers) from the Earth’s surface. Shallower earthquakes have more damage potential, but a temblor's destruction also depends largely on rock and soil conditions as well as building methods.

93. Where are the oldest rocks on Earth found?

Since the ocean floor is being continually regenerated as the continental plates move across the Earth’s surface, the oldest rocks on the ocean floor are less than 300 million years. In contrast, the oldest continental rocks are 4.5 billion years old.

94. What percentage of the world’s fresh water is stored as glacial ice?

About 70 percent. And if you had to replace it all, you'd need 60 years of the entire globe's rainfall, and then you'd have to figure out a way to freeze it all.

95. What is the largest alpine lake in North America?

Lake Tahoe on the California-Nevada border has a 105,000-acre surface, holds 39 trillion gallons of water, and is almost 1,600 feet (488 meters) deep.

96. Have there always been continents?

Not as we know them today. Many scientists figure Earth began as one huge continent -- dry as a bone. Water was delivered in comets, the thinking goes, and the oceans developed. Much more recently, all the world's landmasses were huddled into one supercontinent called Pangaea. It began to break up about 225 million years ago, eventually fragmenting into the continents as we know them today.

97. How much volcanic ash can fall in a day?

I can only give an example. During the 9-hour period of most vigorous activity on May 18, 1980, Mount St. Helens dumped more than 540 million tons of ash over an area of more than 22,000 square miles (56,980 square kilometers). It was the most destructive volcanic eruption known to occur in the United States. Fifty-seven people were killed by the eruption including USGS scientist Dr. David Johnston, who was at a monitoring site 5 miles (8 kilometers) from the volcano. An estimated $1 billion damage was caused by the eruption, through mudflows and landslides as well as what fell from the sky.

98. What is feldspar?

A better question might be, "Who but a geologists could love feldspar?" It happens to be the most common mineral in Earth's crust. But I couldn't find anything about it that most of us really need to know.

99. What are the most extreme locations in the United States, compass-wise?

This one is a bit tricky, and as it turns out three or even four of the answers may catch you off guard. The westernmost point is the aptly named West Point of Amatignak Island, Alaska. The northernmost point is Point Barrow, Alaska. The southernmost point is the southern tip of the island of Hawaii. The easternmost point -- go ahead, take a guess! -- is Pochnoi Point at Semisopochnoi, Alaska. Huh? Look at a world map. The tip of the Aleutian Islands lies on the other side of the 180-degree longitude line --- the International Dateline -- putting Pochnoi Point barely but officially in the Eastern Hemisphere.

100. If you were to arrange Earth, the Moon and Mars like Matryoshka nesting dolls, how would they be ordered?

Mars would nest inside Earth, and the Moon would fit neatly inside Mars. Earth is about twice as big as Mars, which is about twice as big as the Moon.

101. Will Earth always be here?

Astronomers know that over the next few billion years, the Sun will swell so large as to envelop Earth. If we're still here, we'll probably fry and the planet will be vaporized. There's a chance, however, that the changing mass of the Sun will cause Earth to move into a more distant and pleasant orbit. One mathematical calculation shows it would be theoretically possible for humans to engineer such a move before it's too late.

Water, plant, Gold discovered, Gold producing Countries, Mountain, Deadliest Hurricane, Tides

81. Where are the highest tides?

In Burntcoat Head, Minas Basin, part of the Bay of Fundy in Nova Scotia, tides can range 38.4 feet (11.7 meters). The bay is funnel shaped -- its bottom slopes upward continuously from the ocean inlet. The result is an extreme "tidal bore," a wave-like phenomenon at the leading edge of the changing tide. Bores in Fundy can travel up feeder rivers at 8 mph (13 kph) and be more than 3 feet (1 meter) tall.

82. Where is the world's only equatorial glacier?

Mt. Cotopaxi in Ecuador supports the only glacier on the equator.

83. What is the largest lake in North America?

Lake Superior.

84. What's the deadliest hurricane to ever hit the United States?

A Category 4 hurricane hit Galveston, Texas in 1900 and killed more than 6,000 people (read about the history of it here). The next closest death toll was less than 1,900 from a 1928 Florida hurricane.

85. What is the longest mountain chain on Earth?

The Mid-Atlantic Ridge, which splits nearly the entire Atlantic Ocean north to south. Iceland is one place where this submarine mountain chain rises above the sea surface.

86. How much gold has been discovered worldwide to date?

More than 193,000 metric tons (425 million pounds). If you stuck it all together, it would make a cube-shaped, seven-story structure that might resemble one of Donald Trump's buildings. First you'd have to find all those rings that have gone down the drain.

87. What are the two major gold-producing countries?

South Africa produces 5,300 metric tons per year, and the United States produces more than 3,200 metric tons.

88. What North American plant can live for thousands of years?

The creosote bush, which grows in the Mojave, Sonoran, and Chihuahuan deserts, has been shown by radiocarbon dating to have lived since the birth of Christ. Some of these plants may endure 10,000 years, scientists say. If only they could talk.

89. On average, how much water is used worldwide each day?

About 400 billion gallons.

90. Is Saturn the only ringed planet?

Saturn has the most obvious rings. But Jupiter and Neptune both have subtle ring systems, [as does Uranus, readers reminded me]. And even Earth may once have been a ringed planet, the result of some space rock's glancing blow.

Solar System, Ice, Minerals, metals, Rivers, Islands, Lightning strikes & tunder

71. How many lightning strikes occur worldwide every second?

On average, about 100. Those are just the ones that hit the ground, though. During any given minute, there are more than a thousand thunderstorms around the Earth causing some 6,000 flashes of lightning. A lot of it goes from cloud-to-cloud.

72. Are rivers alive?

Not in the traditional sense, of course. But like all living creatures, rivers have a life span. They are born, grow in size, and they age. They can even die during the span of geological time.

73. Can asteroids create islands?

Speculation has existed for decades that ancient asteroid impacts might create hot spots of volcanic activity, which could give rise to mountains that poke up through seas that didn't used to be there. There's no firm answer to this question, but a recent computer model suggested Hawaii might have been formed in this manner.

74. Is the state of Louisiana growing or shrinking?

Louisiana loses about 30 square miles (78 square kilometers) of land each year to coastal erosion, hurricanes, other natural and human causes and a thing called subsidence, which means sinking. Much of New Orleans actually sits 11 feet (3.4 meters) below sea level. Parts of the French quarter have sunk 2 feet in the past six decades. The city is protected by dikes, but all experts agree that storm tides from a direct hit by a major hurricane would breach the system and swamp much of the city. In 2000, the director of the U.S. Geological Survey, Chip Groat, said: "With the projected rate of subsidence, wetland loss and sea-level rise, New Orleans will likely be on the verge of extinction by this time next century."

75. How much would seas rise if the Antarctic Ice Sheet melted?

The Antarctic Ice Sheet holds nearly 90 percent of the world's ice and 70 percent of its fresh water. If the entire ice sheet were to melt, sea level would rise by nearly 220 feet, or the height of a 20-story building. Scientists know there's a melting trend underway. The United Nations has said that in a worst-case scenario -- depending on how much global air temperatures increase -- seas could jump 3 feet (1 meter) by 2100.

77. Is ice a mineral?

Yes, ice is a mineral and is formally described as such in Dana's System of Mineralogy.

77. What is the softest of all minerals?

Talc is the softest of minerals. It is commonly used to make talcum powder.

78. What is the hardest of all minerals?

The one that becomes emotionally useless after a divorce but still retains monetary value.

79. How are colors produced in fireworks?

Mineral elements taken from Earth provide the colors. Strontium yields deep reds, copper produces blue, sodium yields yellow, and iron filings and charcoal pieces produce gold sparks. Bright flashes and loud bangs come from aluminum powder.

80. Does Earth have the worst weather in the solar system?

Right now, it's the worst that most humans I know ever experience. But there's lots of wilder weather elsewhere. Mars can whip up hurricane-like storms four times bigger than Texas. Dust storms on the red planet can obscure the entire globe! Jupiter has a hurricane twice the size our entire planet, and it's lasted for at least three centuries (another storm on Jupiter is even bigger). Venus is a living hell, and Pluto is routinely more frigid than the coldest place on Earth (though may change one day, and Pluto may in fact become the last oasis for life).

Volcanoes, desert, lake

61. What is the world’s largest desert?

The Sahara Desert in northern Africa is more than 23 times the size of southern California’s Mojave Desert. [Several readers have e-mailed to suggest that arid Antarctica technically tops this category; true, some researchers put it there, but most lists of deserts don't include it.]

62. Which planet has more moons, Earth or Mars?

Mars has two satellites, Phobos and Deimos. The Earth has only one natural satellite, but it's the Moon. The outer planets have lots of Moon, most of them found fairly recently and leading to the possibility that scientists might one day need to redefine what it means to be a moon.

63. What is the world’s deepest lake?

Lake Baikal in the south central part of Siberia is 5,712 feet (1.7 kilometers) deep. It's about 20 million years old and contains 20 percent of Earth's fresh liquid water.

64. What is the origin of the word "volcano"?

It derives from Vulcan, the Roman god of fire.

65. How many minerals are known to exist?

There are roughly 4,000 known minerals, although only about 200 are of major importance. Approximately 50-100 new minerals are described each year.

66. What is the total water supply of the world?

The total water supply of the world is 326 million cubic miles (1 cubic mile of water equals more than 1 trillion gallons).

67. What is the world’s largest island?

Greenland covers 840,000 square miles (2,176,000 square kilometers). Continents are typically defined as landmasses made of low-density rock that essentially floats on the molten material below. Greenland fits this description, but it's only about one-third the size of Australia. Some scientists call Greenland an island, others say it's a continent.

68. Where are most of Earth’s volcanoes?

The most prominent topographic feature on Earth is the immense volcanic mountain chain that encircles the planet beneath the sea -- the chain is more than 30,000 miles (48,000 kilometers) long and rises an average of 18,000 feet (5.5 kilometers) above the seafloor. It is called the mid-ocean ridge and is where Earth's plates spread apart as new crust bubbles up -- volcanic activity. There are more volcanoes here than on land. The spreading, however, leads to scrunching when these plates slam into the continents. The result: More volcanoes and earthquakes in places like California and Japan.

69. What volcano killed the most people?

The eruption of Tambora volcano in Indonesia in 1815 is estimated to have killed 90,000 people. Most died from starvation after the eruption, though, because of widespread crop destruction, and from water contamination and disease.

70. Were Earth and the Moon separated at birth?

Not quite. But leading theory holds that our favorite satellite was carved partly from Earth shortly after the Earth formed. A Mars-sized object slammed into our fledgling planet. The impactor was destroyed. Stuff flew everywhere and a lot of it went into orbit around Earth. The Moon gathered itself together out of the largely vaporized remains of the collision, while Earth hung in there pretty much intact.

Things about Tsnumi

51. Does all of Earth spin at the same rate?

The solid inner core -- a mass of iron comparable to the size of the Moon -- spins faster than the outer portion of the iron core, which is liquid. A study in 1996 showed that over the previous century, the extra speed caused the inner core to gain a quarter-turn on the planet as a whole. So the inner core makes a complete revolution with respect to the rest of Earth in about 400 years. Immense pressure keeps it solid.

52. How many people have been killed by volcanoes during the last 500 years?

At least 300,000. Between 1980 and 1990, volcanic activity killed at least 26,000 people.

53. How much of the Earth’s surface consists of volcanic rock?

Scientists estimate that more than three-quarters of Earth’s surface is of volcanic origin-- that is, rocks either erupted by volcanoes or molten rock that cooled below ground and has subsequently been exposed at the surface. Most of Earth’s volcanic rocks are found on the sea floor.

54. Can an earthquake cause a tsunami?

If the earthquake originates under the ocean, yes. Near the earthquake’s epicenter, the sea floor rises and falls, pushing all the water above it up and down. This motion produces a wave that travels outward in all directions. A tsunami can be massive but remain relatively low in height in deep water. Upon nearing the shore, it is forced up and can reach the height of tall buildings. One in 1964 was triggered in Alaska and swamped the small northern California town of Crescent City, moving train cars several blocks and killing several people there. Asteroids can cause tsunami, too.

55. Are all tsunamis high waves when they strike a coastline?

No, contrary to many artistic images of tsunamis, most do not result in giant breaking waves. Rather, most tsunamis come onshore more like very strong and fast tides. The water can rise higher than anyone along a given shore area has ever seen, however. [Model of an East Coast tsunami]

56. How much of the Earth’s land surface is desert?

About one-third.

57. What's the deepest place in the ocean?

The greatest known depth is 36,198 feet (6.9 miles or 11 kilometers) at the Mariana Trench, in the Pacific Ocean well south of Japan near the Mariana Islands.

58. What is the fastest surface wind ever recorded?

The fastest "regular" wind that's widely agreed upon was 231 mph (372 kph), recorded at Mount Washington, New Hampshire, on April 12, 1934. But during a May 1999 tornado in Oklahoma, researchers clocked the wind at 318 mph (513 kph). For comparison, Neptune's winds can rage to 900 mph (1,448 kph).

59. How much fresh water is stored in the Earth?

More than two million cubic miles of fresh water is stored in the planet, nearly half of it within a half-mile of the surface. Mars, too, appears to have a lot of water near its surface, but what's been detected so far is locked up as ice; nobody has estimated how much might be there.

60. How old is Earth?

Our planet is more than 4.5 billion years old, just a shade younger than the Sun. Recent evidence actually shows that Earth was formed much earlier than previously believed, just 10 million years after the birth of the Sun, a stellar event typically put at 4.6 billion years ago.

Elements present on Earth

1. How much surface area does Earth contain?

There are 196,950,711 square miles (510,100,000 square kilometers).

42. What is the largest lake in the world?

By size and volume it is the Caspian Sea, located between southeast Europe and west Asia.

43. Where do most earthquakes and volcanic eruptions occur on Earth?

The majority occur along boundaries of the dozen or so major plates that more or less float on the surface of Earth. One of the most active plate boundaries where earthquakes and eruptions are frequent, for example, is around the massive Pacific Plate commonly referred to as the Pacific Ring of Fire. It fuels shaking and baking from Japan to Alaska to South America.

44. How hot are the planet's innards?

The temperature of Earth increases about 36 degrees Fahrenheit (20 degrees Celsius) for every kilometer (about 0.62 miles) you go down. Near the center, its thought to be at least 7,000 degrees Fahrenheit (3,870 Celsius).

45. What three countries have the greatest number of historically active volcanoes?

The top three countries are Indonesia, Japan, and the United States in descending order of activity.

46. How many people worldwide are at risk from volcanoes?

As of the year 2000, USGS scientists estimated that volcanoes posed a tangible risk to at least 500 million people. This is comparable to the entire population of the world at the beginning of the seventeenth century!

47. Which of the following sources stores the greatest volume of fresh water worldwide: lakes, streams or ground water?

Groundwater comprises a 30 times greater volume than all freshwater lakes, and more than 3,000 times what's in the world’s streams and rivers at any given time. Groundwater is housed in natural underground aquifers, in which the water typically runs around and through the stone and other material.

48. Which earthquake was larger, the 1906 San Francisco earthquake or the 1964 Anchorage, Alaska, temblor?

The Anchorage earthquake had a magnitude of 9.2, whereas the San Francisco earthquake was a magnitude 7.8. This difference in magnitude equates to 125 times more energy being released in the 1964 quake and accounts for why the Anchorage earthquake was felt over an area of almost 500,000 square miles (1,295,000 square kilometers).

49. Which earthquake was more destructive in terms of loss of life and relative damage costs, the 1906 San Francisco earthquake or the 1964 Anchorage earthquake?

The 1906 San Francisco earthquake tops this category. It was responsible for 700 deaths versus 114 from the Anchorage earthquake. Property damage in San Francisco was also greater in relative terms due to the destructive fires that destroyed mostly wooden structures of the time.

50. Is Earth's core solid?

The inner portion of the core is thought to be solid. But the outer portion of the core appears molten. We've never been there though, so scientists aren't sure of the exact composition. A radical Hollywood-like idea was recently put forth to blow a crack in the planet and send a probe down there to learn more. An interesting bit of recent evidence shows Mars' core may be similarly squishy. Scientists figured this out by studying tides on Mars (tides on Mars?).