How come we never run out of water if everyone uses it?
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It goes around and around. Pour an acre-foot of water on a field — some will soak into the ground and run off into a river, thence to the sea, where it will evaporate and precipitate into somebody’s water supply. Or it will evaporate immediately from the field, and then the same. Or a plant will take it up and incorporate the hydrogen and oxygen into its tissue; later it will burn/rot/be eaten and turn into water vapor and/or CO2. And so on.
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