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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.
Rocks formed when magma becomes solid are known as igneous (fire-formed) rocks. One type of igneous rock is granite, which is formed from magma that never reaches the Earth's surface. This magma slowly cools within the Earth. Large crystals of minerals grow within the magma as it gradually hardens.ocks formed when magma becomes solid are known as igneous (fire-formed) rocks. One type of igneous rock is granite, which is formed from magma that never reaches the Earth's surface. This magma slowly cools within the Earth. Large crystals of minerals grow within the magma as it gradually hardens.