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There are two known processes by which magma ceases to exist: by volcanic eruption, or by crystallization within the crust or mantle to form a pluton. In both cases the bulk of the magma eventually cools and forms igneous rocks.
1 Magma is molten rock that flows beneath the earth's surface. 2  Igneous rocks are formed by cooling magma. 3  The location of the formation of the rock, as well as how fast the magma cools will determine the type of igneous rock. 4  Intrusive rocks form from the cooling of magma deep beneath the earths surface. The location of the formation of the rock, as well as how fast the magma cools will determine the type of igneous rock. 2  Intrusive rocks form from the cooling of magma deep beneath the earths surface. 3  Since this occurs below the earth's surface, the magma will cool very slowly. 4  As magma cools, it will form crystals.