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1.26:
The surface area of the earth is about
2
14
2
m
10
5
4
×
=
π
R
, where
R
is the radius of
the earth, about
m
10
6
6
×
, so the surface area of all the oceans is about
2
14
m
10
4
×
. An
average depth of about 10 km gives a volume of
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 Spring '08
 Wheeler

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