Water part 3

So: Water. It goes round and round. Sea, sky, rain, river. Our weather is driven by the physics of water and the rotation of the Earth.

It wears away our mountains and dumps the result in the oceans. There's a lot of water around. If you sneak up on our planet from the correct direction all you can see is sea.

So, where did all this water come from? 

Did it really all arrive in comets from space? All that water came from space. Really? Why did it not all boil away again into space?




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