# earth science

posted by Marisa

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.

1. bobpursley

volume of water:
area*depth=.7*4PIre^2*4000

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

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