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Lassen Volcanic National Park is a national park of the United States in northeastern California. The dominant feature of the park is Lassen Peak, the largest plug dome volcano in the world and the southernmost volcano in the Cascade Range. [3] Lassen Volcanic National Park is one of the few areas in the world where all four types of volcanoes ...
Rhyolite (/ ˈraɪ.əlaɪt / RY-ə-lyte) [1][2][3][4] is the most silica -rich of volcanic rocks. It is generally glassy or fine-grained (aphanitic) in texture, but may be porphyritic, containing larger mineral crystals (phenocrysts) in an otherwise fine-grained groundmass. The mineral assemblage is predominantly quartz, sanidine, and plagioclase.
2; the higher the silica content, the greater the ability of the magma to trap and hold on to gas and water vapor. When high-silica magma rises to the Earth's surface, the trapped gases and vapors can erupt explosively to produce ash clouds and pyroclastic flows that consist of superheated gas, ash and volcanic fragments.
This is an accepted version of this page This is the latest accepted revision, reviewed on 9 September 2024. Mountain in the US featuring a sculpture of four presidents For the band, see Mount Rushmore (band). Mount Rushmore National Memorial Shrine of Democracy Tȟuŋkášila Šákpe Mount Rushmore features Gutzon Borglum's sculpted heads of George Washington, Thomas Jefferson, Theodore ...
A magma chamber is a large pool of liquid rock beneath the surface of the Earth. The molten rock, or magma, in such a chamber is less dense than the surrounding country rock, which produces buoyant forces on the magma that tend to drive it upwards. [1] If the magma finds a path to the surface, then the result will be a volcanic eruption ...
Mount Mazama (Tum-sum-ne in the Native American language Klamath [5]) is a complex volcano in the western U.S. state of Oregon, in a segment of the Cascade Volcanic Arc and Cascade Range. The volcano is in Klamath County, in the southern Cascades, 60 miles (97 km) north of the Oregon– California border and. Its collapse, due to the eruption ...
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