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  Water on Earth

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meodingu
Kig 'Yar
Kig 'Yar


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Number of posts : 141
Age : 31
Registration date : 2010-10-13

PostSubject: Water on Earth   Sat Nov 13, 2010 11:12 am


Water on Earth
The Iguazu waterfalls in the border between Brazil and Argentina.
Main article: Water

Water is a chemical substance that is composed of hydrogen and oxygen and is vital for all known forms of life.[27] In typical usage, water refers only to its liquid form or state, but the substance also has a solid state, ice, and a gaseous state, water vapor or steam. Water covers 71% of the Earth's surface.[28] On Earth, it is found mostly in oceans and other large water bodies, with 1.6% of water below ground in aquifers and 0.001% in the air as vapor, clouds (formed of solid and liquid water particles suspended in air), and precipitation.[29] Oceans hold 97% of surface water, glaciers and polar ice caps 2.4%, and other land surface water such as rivers, lakes and ponds 0.6%. Additionally, a minute amount of the Earth's water is contained within biological bodies and manufactured products.






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