these volcanoes are the southernmost volcanoes of the cascade
volcanic chain.
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The Cascade volcanoes stretch from British Columbia, Canada to
California, United States. Mount Rainier is among the Cascade
volcanoes and is located in the U.S. state of Washington.
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Penis Butt
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There are no active volcanoes in Montana. You have to go further
west to the Cascade Range to find volcanoes. The volcanoes in the
Cascades are caused by the subduction of the oceanic crust under
the continental crust.