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A student condudes that Earth's lithosphere is gradually shrinking as crust is destroyed at subduction zones. What is wrong with this conclusion?
 
A Earth's lithosphere is not shrinking because the crust is not actually destroyed at subduction zones; it simply sinks into the mantic before resurfacing elsewhere.
B Earth's lithosphere is not shrinking because new crust is being created at mid-ocean ridges.
C The student is correct, Earth's lithosphere is shrinking:

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