How come we never run out of water if everyone uses it?

Question

How come we never run out of water if everyone uses it?

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Answer 1

Water stays on Earth.

After using it, it mostly ends up in some combination of the ocean or atmosphere – and once it evaporates from the ocean, it’s in the atmosphere anyway. Then it rains – which is where our water comes from.

The critical part of “using” water is that we can’t drink or wash in dirty water – we’re using clean water and turning it into dirty water.