articles

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

A Cascade Range volcano is one that is part of a series of mountains in western North America that includes an arc of volcanoes. The Cascade Range extends from British Columbia through Washington and Oregon to northern C... More »

www.reference.com Science Earth Science Volcanoes
similar articles

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

In March 1991 and April 1991, magma rising 20 miles beneath the surface of the Pinatubo volcano caused many earthquakes and small explosions, which destroyed parts of the volcano. Then on June 12, 1991, magma filled with... 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