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Metamorphic rocks started out as some other type of rock, but have been substantially changed from their original igneous, sedimentary, or earlier metamorphic form.

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Sedimentary rocks are formed from deposits of pre-existing rocks or pieces of once-living organism that accumulate on the Earth's surface. If sediment is buried deeply, it becomes compacted and cemented, forming sedimentary rock.

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Sediment is solid material that is moved and deposited in a new location. Sediment can consist of rocks and minerals, as well as the remains of plants and animals. It can be as small as a grain of sand or as large as a boulder. Sediment moves from one place to another through the process of erosion

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Volcanic Eruption happens when lava and gas are released from a volcano—sometimes explosively. When enough magma builds up in the magma chamber, it forces its way up to the surface and erupts.

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Igneous rocks are rocks formed from the cooling and solidification of molten magma from the earth beneath. Igneous rocks may result to primary and secondary landforms.

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Hot material rises to areas of lower pressure. Areas of lower pressure have a lower melting point. This decrease in pressure is called decompression. Decompression allows the mantle rock to melt and form magma.