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Is water on earth finite?

Is water on earth finite? Is it always the same amount of water changing from liquid to solid to gas and back again?
Connie from Inverclyde (age 15-24)

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One Response

  1. Yes it is finite, but as your question realises it is not being used up but rather re-cycled. It hasn’t always been the same amount, over long geological time periods the amount has changed considerably. Also remember that water makes up a high proportion of the bodies of living things, and plants, for example, use it in photosynthesis. So it is not just recycling through the seas, rivers, glaciers, clouds and rain but also through all living organisms. You should be able to find out more by searching “Water Cycle” on the web.

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