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  2. 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 ...

  3. Mount Mazama - Wikipedia

    en.wikipedia.org/wiki/Mount_Mazama

    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.

  4. Magma chamber - Wikipedia

    en.wikipedia.org/wiki/Magma_chamber

    Magma chamber. 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 ...

  5. Magma - Wikipedia

    en.wikipedia.org/wiki/Magma

    Magma. 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]

  6. Magmatism - Wikipedia

    en.wikipedia.org/wiki/Magmatism

    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 ...

  7. Phreatic eruption - Wikipedia

    en.wikipedia.org/wiki/Phreatic_eruption

    Phreatic eruption at the summit of Mount St. Helens, Washington, in the spring of 1980. A phreatic eruption, also called a phreatic explosion, ultravulcanian eruption or steam-blast eruption, [ 1] occurs when magma heats ground water or surface water. The extreme temperature of the magma (anywhere from 500 to 1,170 °C (930 to 2,100 °F ...

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