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Home Q & A Board Science-Related Homework Help Geography and Earth Sciences
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bio_man bio_man
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During the ________ Era, the westward-moving North American plate began to override the Pacific plate, eventually causing the tectonic activity that formed the mountains of western North America.
A) Precambrian
B) Paleozoic
C) Mesozoic
D) Cenozoic
E) none of the above
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LilligantLilligant
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Source  http://en.wikipedia.org/wiki/Mesozoic
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