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If the rocks get buried deep enough:
*Heat and Pressure - The rock is either changed by the heat and pressure into a [[Metamorphic]] rock or the rock is [[melted]] to become [[magma]].
*[[Uplift]] - Pressure from underneath the rock causes it to rise to the surface.
*Volcanoes - The molten rock comes out of [[volcano]]es as [[lava]] before it freezes to become an [[Igneous]] rock.