earth science

The global ocean covers about 70% of the Earth’s surface. If all the ocean water was uniformly distributed over the whole surface, what would be its depth? Assume that the Earth is a perfect sphere, and the average ocean depth is 4 km.

asked by Marisa
  1. volume of water:
    area*depth=.7*4PIre^2*4000

    so if it is spread..
    area*depth=4PIre^2*depth

    because it is the same volume of water,
    .7*4PI*re^2*4000=4PI*re^2*d

    d=4000*.7 m

    posted by bobpursley

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