Multiple Choice
What mechanism is proposed for Cretaceous subsidence of the Canadian and American prairies?
A) An underlying mantle plume suddenly quit, cooled, and subsided.
B) A subducting slab detaches from the trailing lithosphere, creating a downward flow that drags the base of the overriding continent with it.
C) A former broad monocline under the prairies eventually flattened out.
D) A large Cretaceous meteorite impacted the prairies, the evidence for which has yet to be found.
Correct Answer:
Verified
Correct Answer:
Verified
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