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Before a rock can become an igneous rock, it must undergo melting to transform from solid rock into molten magma or lava. Once this molten material cools and solidifies, either beneath the Earth's surface (forming intrusive igneous rocks) or on the surface following a volcanic eruption (forming extrusive igneous rocks), it becomes igneous rock.

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What must happen to lava in order for it to become igneous rock?

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What must happen to an igneous rock before it can become a sedimentary or metamorphic rock?

To become a sedimentary rock, an igneous rock must first be weathered, and then eroded, and then deposited as a sediment, and then consolidated (e.g. by cementation or pressure welding of grains.) To become a metamorphic rock it must be transformed by heat and pressure, which it can do directly (e.g. granite turning into gneiss) or after first turning into a sedimentary rock.


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Two processes a rock must undergo before becoming an igneous rock are melting, where the rock is heated to a point where it turns into magma, and cooling, where the magma solidifies to form an igneous rock.


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What are three processes that a sedimentary or igneous rock must experience before it can become a metamorphic rock?

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Igneous rock must weather and erode into smaller pieces and grains through processes like physical and chemical weathering. These sediments then accumulate, are buried, and undergo compaction and cementation to form sedimentary rock.


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