Impact craters caused by meteorites smashing into Earth have been found all around the globe, but they have been found in the greatest density in geologically stable regions. This relatively greater abundance of securely identified crater in geologically stable regions must be explained by the lower rates of destructive geophysical processes in those regions.
The conclusion is properly drawn if which one of the following is assumed?
(A) A meteorite that strikes exactly the same spot as an earlier meteorite will obliterate all traces of the earlier impact.
(B) Rates of destructive geophysical processes within any given region vary markedly throughout geological time.
(C) The rate at which the Earth is struck by meteorites has greatly increased in geologically recent times.
(D) Actual meteorite impacts have been scattered fairly evenly over the Earthâ€™s surface in the course of Earthâ€™s geological history.
(E) The Earthâ€™s geologically stable regions have been studied more intensively by geologists than have its less stable regions.
Premise: more crater in stable regions
Premise: lower rates of destructive geophysical process in stable regions.
Conclusion: more crater in stable regions because of lower rates of destructive geophysical process.Assumption: meteorites impacted evenly both the stable regions and unstable regions. If meteorites impacted more in stables regions ==> more craters ==> the conclusion fails.
D clearly states the conclusion.
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