Why does the hypsometric curve show two broad flat areas, one at about 840 meters above sea level and another at about 3740 meters below sea level?
a) Because the oceans are filled with water, which depresses the ocean floor
b) These two levels represent average continent and ocean heights resulting from isostasy.
c) Trenches are found only in the oceans.
d) The oceans cover 70% of the Earth.
e) Both continents and the sea floor are mostly flat.
B
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