<Tr> <Th_colspan="2"> Geology </Th> </Tr> <Tr> <Th> Age of rock </Th> <Td> Pliocene </Td> </Tr> <P> The Cascade Range or Cascades is a major mountain range of western North America, extending from southern British Columbia through Washington and Oregon to Northern California . It includes both non-volcanic mountains, such as the North Cascades, and the notable volcanoes known as the High Cascades . The small part of the range in British Columbia is referred to as the Canadian Cascades or, locally, as the Cascade Mountains . The latter term is also sometimes used by Washington residents to refer to the Washington section of the Cascades in addition to North Cascades, the more usual U.S. term, as in North Cascades National Park . The highest peak in the range is Mount Rainier in Washington at 14,411 feet (4,392 m). </P> <P> The Cascades are part of the Pacific Ocean's Ring of Fire, the ring of volcanoes and associated mountains around the Pacific Ocean . All of the eruptions in the contiguous United States over the last 200 years have been from Cascade volcanoes . The two most recent were Lassen Peak from 1914 to 1921 and a major eruption of Mount St. Helens in 1980 . Minor eruptions of Mount St. Helens have also occurred since, most recently from 2004 to 2008 . The Cascade Range is a part of the American Cordillera, a nearly continuous chain of mountain ranges (cordillera) that form the western "backbone" of North America, Central America, and South America . </P>

Where are the cascade mountains located on a map
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