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Igneous rock is the rock that forms from molten magma or lava. 

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Igneous rock is the rock that forms from molten magma or lava. 

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Extrusive rocks are formed on the surface of the earth from lava, which is magma that comes from underground.

Intrusive rocks are formed from the magma or lava that has cooled down on the surface.

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Sedimentary rocks are formed from the solidification of sediment.

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Sedimentary rocks are formed from the solidification of sediment.

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Clastic sedimentary rocks are formed from mineral fragments that are compressed and cemented together.

Organic sedimentary rocks are formed from the parts of animals or plants.

Chemical sedimentary rocks form when water travels through the rock and dissolves some of the minerals.

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Metamorphic rocks are formed through change of igneous and sedimentary rocks, they can form on ground and underground. 

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Metamorphic rocks are formed through change of igneous and sedimentary rocks, they can form on ground and underground. 

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Foliate metamorphic rocks like gneiss, phyllite, schist, and slate have a layered appearance that is formed from exposure to heat and pressure

Unfoliated metamorphic rocks like hornfels, marble and quartzite, they have more of a grainy look to them.