Our planet, Earth, is the only place in the universe known to have liquid water.1 In fact, astronauts looking at Earth’s surface from outer space see mainly water. The ocean covers 71% of the total area, and contains enough water to cover the whole planet to a depth of 2.7 km (1.7 miles) if the surface were completely flat.
Salinity
The ocean is essential for life on Earth, and also helps make the climate fairly moderate. However, although the ocean contains 1,370 million cubic kilometres (334 million cubic miles) of water, humans can’t survive by drinking from it—it is too salty.
Read More Salty seas: Evidence for a young earth.
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