If I've been given the density of water, how do I go about calculating the mass of all the water on Earth.(adsbygoogle = window.adsbygoogle || []).push({});

Of course, density = m/v, and whilst water covers 2/3 (?) of the Earths surface, how can I work this into the volume? Would it be the 2/3 * surface area of Earth * average depth of the oceans?

This is assuming that sea water has the same density as fresh water (which is obviously not the case, but still - its what the question states)

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# Mass of Earths water (simply)

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