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Guyot. In marine geology, a guyot ( ⫽ ˈɡiː.oʊ, ɡiːˈoʊ ⫽ ), [1] [2] also called a tablemount, is an isolated underwater volcanic mountain ( seamount) with a flat top more than 200 m (660 ft) below the surface of the sea. [3] The diameters of these flat summits can exceed 10 km (6 mi). [3] Guyots are most commonly found in the Pacific ...
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. A volcanic peak once existed, but it collapsed following a major eruption approximately 7,700 years ago, to be replaced by a caldera.
Magma can be found in the mantle or molten crust. Magma (from Ancient Greek μάγμα (mágma) 'thick unguent ') [1] is the molten or semi-molten natural material from which all igneous rocks are formed. [2]
Eruption on July 22, 1980The growing third dome on October 24, 1980. St. Helens produced an additional five explosive eruptions between May and October 1980. Through early 1990, at least 21 periods of eruptive activity had occurred. The volcano remains active, with smaller, dome-building eruptions continuing into 2008.
Mount Pinatubo [4] is an active stratovolcano in the Zambales Mountains, located on the tripoint boundary of the Philippine provinces of Zambales, Tarlac and Pampanga, all in Central Luzon on the northern island of Luzon. [5] [6] Most people were unaware of its eruptive history before the pre-eruption volcanic activity in early 1991.
After the explosion, its peak elevation had dropped to only 2,851 m (9,354 ft), about two-thirds of its previous height. [15] The 1815 Tambora eruption is the largest observed eruption in recorded history, as shown in the table below. [8] [4] The explosion was heard 2,600 km (1,600 mi) away, and ash fell at least 1,300 km (810 mi) away.
Magmatism. Geological map showing the Gangdese batholith, which is a product of magmatic activity about 100 million years ago. Magmatism is the emplacement of magma within and at the surface of the outer layers of a terrestrial planet, which solidifies as igneous rocks. It does so through magmatic activity or igneous activity, the production ...
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.
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