Phanor65
Answered

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Why are the Rocky Mountains described as younger?

Sagot :

lrathburn
The Rocky Mountains are described as younger because the Rocky's are really two mountain chains. The older mountain chain started billions of years ago, and the younger mountain chain pushed the older mountain chain up more, only 60 millions years ago. 
The younger Rocky Mountains are described as the Little Rocky Mountains that are an island on the northern Great Plains of Montana.
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