The Rocky Mountains are known for beautiful scenery. Which processes of the Rocky Mountains most likely required the longest period of time to occur?
A. growth of plants and trees
B. formation of valleys from glaciers
C. large uplift of the land from tectonic forces
D. large accumulation of snow on the mountaintops

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Answers

2014-11-30T22:23:23+08:00
I think its B but im not sure about it.

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