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Mount Mazama is a composite volcano. It is made of multiple layers of lava flows and fragmented debris. Mount Mazama had a violent eruption around 5677 B.C., which caused the main height of the volcano to collapse and cr... More »

www.reference.com Science Earth Science Volcanoes

Mount Mazama last erupted in 2290 B.C. The eruption was so severe that the volcano collapsed, forming a caldera. This means that during the eruption, the volcano sank into the ground, creating a giant crater. The crater ... More »

www.reference.com Science Earth Science Volcanoes

Crater Lake in Oregon is 1,943 feet deep, according to the National Park Service. That makes Crater Lake the deepest U.S. lake and the world's ninth deepest. More »

www.reference.com Geography Bodies of Water
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Mount Mazama last erupted in 2290 B.C. The eruption was so severe that the volcano collapsed, forming a caldera. This means that during the eruption, the volcano sank into the ground, creating a giant crater. The crater ... More »

www.reference.com Science Earth Science Volcanoes

Mount Vesuvius is a volcano that is roughly 4,300 feet tall, according to About.com's Ancient/Classical History expert. It is located in Italy, near the Bay of Naples. More »

www.reference.com Science Earth Science Volcanoes

Mount Kilauea on the Big Island of Hawaii is a shield volcano. Its continuous lava flow since 1983 is a defining characteristic of a shield volcano. More »

www.reference.com Science Earth Science Volcanoes

The eruption of Mount St. Helens at 8:32 on May 18, 1980 was a major geological event that continues to have many effects on the 150 square miles surrounding the volcano. This eruption is classified as the worst volcanic... More »

www.reference.com Science Earth Science Volcanoes