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You asked:

are there volcanoes in the rocky mountains

Yes. Rocky Mountains has a volcano.
Rocky Mountains

The Rocky Mountains (Hoˀhonáaˀe tse-amoˀėstse "Rock on the Horizon" in Cheyenne), often called the Rockies, the broad mountain range in western North America


volcano (a ruptured area of rock in the earth's crust which allows hot, molten rock, ash, and gases to escape from below the surface)