During the rock cycle, subduction pushes rock into the mantle. the rock melts into magma, which will eventually cool into
sedimentary rock
igneous rock
metamorphic rock
sandstone

Cooled magma forms igneous rocks. These rocks either crystallize or freeze, resulting two types of igneous rocks – extrusive igneous rocks and intrusive igneous rocks. Extrusive or volcanic igneous rocks result from a magma that melted quickly above the earth’s surface or near the earth’s surface. Crystals may form but needs to be magnified to be seen by the naked eye. Example of this type of rocks includes obsidian, basalt and pumice. Intrusive or plutonic igneous rocks are formed from magma that cooled underground or below the Earth’s surface. Because these rocks slowly-cooled, large crystals are formed which is visible to the naked eye. Examples of this type of rocks are diorite, granite and peridotite.

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