How long is it estimated to take the ocean's volume of water to circulate through the oceanic crust at

spreading centers?
a. 1 million years
b. 10 million years
c. 100 million years
d. 1 billion years


ANS: B
It is estimated that a volume of water equal to the volume of the world's ocean is thought to circulate
through the hot oceanic crust at spreading centers about every 10 million years. The heat and
chemicals released through this circulation process is thought to play an important role in the chemical
composition of the seafloor and even the atmosphere. Information can be found in the section The
Topography of Deep-Ocean Basins Differs from That of the Continental Margins.

Environmental & Atmospheric Sciences

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