The term magma is used to describe the molten rock material within the earth’s crust which eventually consolidates to become igneous rock. If the magma crystallises in the deeper parts of the crust, the resulting rock is termed plutonic. If the magma pushes its way up to the surface through cracks or along volcanic vents, it forms lava flows which consolidate into volcanic or extrusive rocks. The crystallisation of minerals in lava takes place at temperatures ranging from 1100° C down to 700° C.
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