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  2. Mount Mazama - Wikipedia

    en.wikipedia.org/wiki/Mount_Mazama

    Its collapse, due to the eruption of magma emptying the underlying magma chamber, formed a caldera that holds Crater Lake (Giiwas in the Native American language Klamath). [6] Mount Mazama originally had an elevation of 12,000 feet (3,700 m), but following its climactic eruption this was reduced to 8,157 feet (2,486 m).

  3. 1980 eruption of Mount St. Helens - Wikipedia

    en.wikipedia.org/wiki/1980_eruption_of_Mount_St...

    On March 27, 1980, a series of volcanic explosions and pyroclastic flows began at Mount St. Helens in Skamania County, Washington, United States. A series of phreatic blasts occurred from the summit and escalated until a major explosive eruption took place on May 18, 1980, at 8:32 am. The eruption, which had a volcanic explosivity index of 5 ...

  4. Guyot - Wikipedia

    en.wikipedia.org/wiki/Guyot

    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 Ocean ...

  5. Laccolith - Wikipedia

    en.wikipedia.org/wiki/Laccolith

    A laccolith is a type of igneous intrusion, formed when magma forces its way upwards through the Earth's crust but cools and solidifies before reaching the surface. Laccoliths are distinguished from other igneous intrusions by their dome-shaped upper surface and level base. They are assumed to be fed by a conduit from below, though this is ...

  6. Lake Toba - Wikipedia

    en.wikipedia.org/wiki/Lake_Toba

    The lake is located in the middle of the northern part of the island of Sumatra, with a surface elevation of about 900 metres (2,953 ft), the lake stretches from 2.88°N 98.52°E to 2.35°N 99.1°E. The lake is about 100 kilometres (62 miles) long, 30 kilometres (19 mi) wide, and up to 505 metres (1,657 ft) deep. It is the largest lake in ...

  7. Volcanic plug - Wikipedia

    en.wikipedia.org/wiki/Volcanic_plug

    An aerial view of the Gros Piton and Petit Piton, in St. Lucia, 2006. A volcanic plug, also called a volcanic neck or lava neck, is a volcanic object created when magma hardens within a vent on an active volcano. When present, a plug can cause an extreme build-up of high gas pressure if rising volatile -charged magma is trapped beneath it, and ...

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