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Encyclopedia > Volcanic crater
Craters on Mount Cameroon
Craters on Mount Cameroon

Perhaps the most conspicuous part of a volcano is the crater, a basin of a roughly circular form within which occurs a vent (or vents) from which magma erupts as gases, lava, and ejecta. A crater can be of large dimensions, and sometimes of vast depth. Very large features of this sort are termed calderas. Some volcanoes consist of a crater alone, with scarcely any mountain at all; but in the majority of cases the crater is situated on top of a mountain (the volcano), which can tower to an enormous height. Volcanoes that terminate in a principal crater are usually of a conical form. Image File history File links Download high resolution version (1000x667, 657 KB) Volcanic craters on Mount Cameroon. ... Image File history File links Download high resolution version (1000x667, 657 KB) Volcanic craters on Mount Cameroon. ... Mount Cameroon (also known as Cameroon Mountain or Fako) is an active volcano in Cameroon, near the Gulf of Guinea and is part of a general area of volcanic activity the Cameroon Volcanic Line, which also includes Lake Nyos, the site of the 1986 Lake Nyos tragedy. ... For other meanings, see Eruption (disambiguation). ... Magma is molten rock located beneath the surface of the Earth (or any other rocky planet), and which often collects in a magma chamber. ... Satellite image of Santorini. ...


On Earth, volcanic explosion craters are often formed when magma rises through water-saturated rocks and causes a phreatic, or steam explosion. Volcanic explosion craters from phreatic eruption often occur on plains away from other obvious volcanoes. Other volcanic eruptions can cause mild explosions, often in a series of events. Some volcanic craters form by collapse with little or no explosive activity. Volcanic craters are typically seen either on the summits or on the flanks of volcanoes. Volcanic craters have also been identified on the Moon, Mars, Venus, and Io. A steam explosion (also called a littoral explosion, or fuel-coolant interaction, FCI) is a violent boiling or flashing of water into steam, occurring when water is either superheated, or rapidly heated by fine hot debris produced within it. ... Moon is the current Good Article Collaboration of the week! Please help to improve this article to the highest of standards. ... Mars is the fourth planet from the Sun in the solar system, named after the Roman god of war (the counterpart of the Greek Ares), on account of its blood red color as viewed in the night sky. ... (*min temperature refers to cloud tops only) Atmospheric characteristics Atmospheric pressure 9. ... Atmospheric characteristics Atmospheric pressure trace Sulfur dioxide 90% Io (eye-oe, IPA: , Greek Ῑώ) is the innermost of the four Galilean moons of Jupiter. ...

Volcán Irazú, Costa Rica
Volcán Irazú, Costa Rica

 
 

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