Q:

What type of magma does Mount Shasta have?

A:

Quick Answer

Mount Shasta's magma is composed of basalts and basaltic andesite. These two types of magma are very runny, forming large shield cones and steep, loose tephra cones. The basaltic andesites at Mount Shasta are unusually rich in magnesium.

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Full Answer

Mount Shasta is located in northern California and is the second largest volcano in the Cascade Range. Mount Shasta's landscape includes four overlapping cones and seven glaciers. Rising nearly 10,000 feet in the air, it is remarkable for the large avalanche that removed its entire northern side approximately 300,000 years ago. This was one of the largest avalanches known on Earth. The last confirmed eruption of Mount Shasta was in 1786.

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  • Q:

    What are the names of some composite volcanoes?

    A:

    Famous composite volcanoes include Mount Fuji in Japan, Mount Cotopaxi in Ecuador, Mount Shasta and Mount Lassen in California, Mount Hood in Oregon, Mount St. Helens and Mount Rainier in Washington, Mount Pinatubo in the Philippines, and Mount Etna in Italy. Many of these volcanoes are located around the Pacific Rim.

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  • Q:

    What landforms are created by lava and ash?

    A:

    Landforms created by lava include shield volcanoes, stratovolcanoes or composite volcanoes, lava domes and flood basalts, according to Tulane University. Although primarily caused by lava, stratovolcanoes also contain volcanic material such as ash. Cinder cones also contain significant amounts of ash.

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  • Q:

    What landforms do volcanoes create?

    A:

    Including the volcanoes themselves, the major landforms volcanoes create include shield volcanoes, stratovolcanoes or composite volcanoes, maars, cinder or tephra cones, volcanic or lava domes, craters, calderas, geysers, hot springs, resurgent domes, flood basalts and plateau basalts. Many of these landforms have significant impacts on ecosystems, according to Tulane University.

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  • Q:

    When did Mt. Shasta last erupt?

    A:

    Mt. Shasta last erupted in 1786, and the French explorer La Pérouse witnessed it from his ship. The highest cone of the mountain, Hotlum Cone, has erupted at least eight times during the past 8,000 years. It is located in Siskiyou County, California.

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