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.

earth science 
bobpursley
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
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