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Originally Posted by Socks
For example, they say that water can't be destroyed, only converted to a different form, and so minus the water we've sent into space, we have the same amount of water on earth as when the dinosaurs lived.
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no, we have more. Comets and meteorites (small ones as well as large ones) hit the earth all the time, and many contain water. it doesn't sound like a lot, but over millions of years and the amount of objects the hit the earth every day ads up to a lot of water
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