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Landmark: Earth
Volcanoes
Mountains formed by volcanic material or fissures through which molten lava and gases erupt.
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The protected area's features are volcanic and represent one of the best preserved flood basalt areas in the continental United States. It is composed of encompass three major lava fields and about 400 square miles (1,036 km2) of sagebrush steppe grasslan
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Dotsero is a 700 meter wide by 400 meter deep maar volcano (broad, low relief crater). Erupting approximately 4200 years ago, it is the youngest volcano in Colorado. It is currently dormant.
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Only about 2000 feet (600 m) above sea level, Mount Adagdak consists of a small stratovolcano capping an older shield volcano. The date of its last known eruption is unknown, but a basaltic lava dome was constructed on the southeast side.
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In 1982, the 110,000-acre Mount St. Helens National Volcanic Monument was created for research, recreation, and education. Inside the Monument, the environment is left to respond naturally in recovering from the 1980 eruption and any future disturbance.
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SP Crater is a cinder cone volcano. The base of the cone is 3,900 feet (1,200 m) across and 820 feet (250 m) tall. It has a lava flow that extends for four miles to the north.
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Sunset Crater was named for its brilliantly colored scoria deposits mantling the cone. Having erupted sometime between 1080 and 1150 AD, it is the youngest of the more than 550 vents of the vast San Francisco volcanic field.
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