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Arun Singh
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All the Water on Planet Earth

How much of planet Earth is made of water? Very little, actually. Although oceans of water cover about 70 percent of Earth's surface, these oceans are shallow compared to the Earth's radius. This illustration shows what would happen if all of the water on or near the surface of the Earth were bunched up into a ball. The radius of this ball would be only about 700 kilometers, less than half the radius of the Earth's +Moon. How even this much water came to be on the Earth and whether any significant amount is trapped far beneath Earth's surface remain topics of research.

Source: http://earthspacecircle.blogspot.com/2013/01/all-water-on-planet-earth.html
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