How Were the Rocky Mountains Formed?

Answer

The Rocky Mountains were formed when forces under the earth's crust (tectonic plates) were pushing against each other forcing the land to move upward. This happened millions of years ago.
Q&A Related to "How Were the Rocky Mountains Formed?"
Put a piece of notebook paper flat on a table. Put your hands on the opposite two ends. Slide your hands toward each other, and the paper will lift right up between your hands. This
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The Rockies were formed mainly by crustal uplifts, during the late Cretaceous
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They were formed between 100 million years ago and 50 million years ago, when the Farallion Plate subducted beneath the North American Plate. The collisi0on of these two plates caused
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The Taconic Orogeny (mountain building) in the Ordovician Age (430 million years ago) was the first of three plate collisions on the east coast of North America. The "core"
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1 Additional Answer
The Rocky Mountains were formed when the large plates that form the surface of the earth moved around and collided with each other. It is thought that this occurred over 120 million years ago. The plates are moving still, albeit very slowly. You can find more information here: http://www.mountainnature.com/geology/platetectonics.htm
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