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Mountains and mountain ranges have varied origins. Some are the erosional remnants of plateaus ; others are cones built up by volcanoes , such as Mt. Rainier in Washington, or domes pushed up by intrusive igneous rock (see rock ), such as the Black Hills of South Dakota and the Henry Mts., Utah. Fault-block mountains (see fault ) are formed by the raising of huge blocks of the earth's surface relative to the neighboring blocks. The Basin and Range region of Nevada, Arizona, New Mexico, and Utah is one of the most extensive regions of fault-block mountains.
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