– How will water eventually run out?

Question

Water has been described as a finite resource. I’m talking about all water – not fresh drinkin water.

I understand that there are various things that water goes through to be recirculated through the environment, such as being absorbed by the sun and there is a cycle. But how can this lead to water being a finite resource? Are there other ‘destructive’ processes involving water that means it will be lost forever?

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Answer 1

There is a finite amount of water on Earth, about 10^18 tons. There is only a finite mass for the Earth itself. While 10^18 tons a lot, it’s not an infinite amount. It’s only .025% of the mass of the crust of the Earth.