Crystal: solid that has a variety of special shapes.
Extrusive igneous rocks: igneous rocks that form on the surface of the Earth.
Geology: the study of rocks, their history and the processes that form and change them.
Igneous rocks: rocks formed from cooling magma.
Interlocking crystals: crystals that lock together and grow into each other in a rock.
Intrusive igneous rocks: igneous rocks that form below the surface of the earth.
Lava: molten rock reaching the Earth's surface.
Magma: molen rock that does not reach the earth's surface.
Mantle: layer of the earth below the crust.
Minerals: chemical substances found in rocks.

	Created by Opal Khan over 7 years ago

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