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Sedimentary

rock which was formed out of soil, silt, sand, seashells, bits of pieces of everything. The tiny bits settled and built up in thick layers. Minerals from water seeped into the spaces between the particles and bonded them into solid rock. The Grand Canyon is made up of sandstone, limestone, and shale which are all sedimentary rocks.

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Sedimentary Rock

Metamorphic

(means to "change")

rock used to be igneous or sedimentary rock that was changed by heat or pressure or both. The Appalachian Mountains including the Blue Ridge are mainly metamorphic rock with a little igneous rock.

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Metamorphic Rock

Igneous

(means "fire")

igneous rock was once hot liquid inside the earth. Rock that erupted from volcanoes and cooled on the surface is called extrusive igneous rock. Igneous rock that cooled more slowly inside the Earth is called intrusive. Apache Tear and the Hawaiian Islands are mainly igneous rock.

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Igneous Rock