• Question: how much water is on our planet?

    Asked by 697putk52 to Jake on 28 Nov 2017.
    • Photo: Jake Langham

      Jake Langham answered on 28 Nov 2017:


      Lots. The Earth is quite big after all. It’s about a billion cubic kilometers. One cubic kilometer is equal to 1000000000000 litres (there should be 12 zeros there if I counted right).

      So the total water is 1000000000000000000000 litres (21 zeros).

      A big number yes, but believe me, you’d notice if there were only a mere 100000000000000000000 litres of water on Earth.

      It’s almost all oceans by the way (ice, lakes, and clouds etc don’t add much).

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