Difference between revisions of "Magma"
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| − | [[ | + | [[Image:Magma.gif|thumb|300px|Sketch of a magma reservoir beneath a volcano and a conduit leading up to a lava dome at the surface. Arrow indicates direction of magma movement from a deeper source.]]'''Magma''' is molten or partially molten [[rock]] beneath the [[Earth]]'s surface. When magma erupts onto the surface, it is called [[lava]]. Magma typically consists of a liquid portion (often referred to as the melt), a solid portion made of [[mineral]]s that crystallized directly from the melt, solid rocks incorporated into the magma from along the conduit or reservoir, called [[xenolith]]s or inclusions, and dissolved gases. |
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Latest revision as of 15:02, August 7, 2010
Magma is molten or partially molten rock beneath the Earth's surface. When magma erupts onto the surface, it is called lava. Magma typically consists of a liquid portion (often referred to as the melt), a solid portion made of minerals that crystallized directly from the melt, solid rocks incorporated into the magma from along the conduit or reservoir, called xenoliths or inclusions, and dissolved gases.