Photoglossary

Magma

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 (1) a liquid portion (often referred to as the melt); (2) a solid portion made of minerals that crystallized directly from the melt; (3) solid rocks incorporated into the magma from along the conduit or reservoir called xenoliths (from the greek ksénos, stranger + lithos, rock) or inclusions; and (4) dissolved gases.

As magma, by definition, is always beneath the Earth's surface, no photo can be shown here...

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