On a map showing the age of the seafloor, why are the patterns symmetrical in the Atlantic Ocean but not the Pacific Ocean?
A. Spreading in the Atlantic has been faster than sea-floor spreading in the Pacific.
B. Subduction has consumed large areas of old oceanic crust in the Atlantic, more than in the Pacific.
C. Spreading along the Atlantic ridge added seafloor to plates on both sides, while subduction has consumed large areas of old oceanic crust in the Pacific.
D. Subduction occurred at the same rate along the eastern and western sides of the Atlantic, but not in the Pacific.
Answer: C
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