Saturday, May 7, 2011

Rock Categories

Igneous rocks are formed from melted rock that has cooled and solidified.

Sedimentary rocks are formed at the surface of the Earth, either in water or on land.

Sometimes sedimentary and igneous rocks are subjected to pressures so intense or heat so high that they are completely changed. They become metamorphic rocks, which form while deeply buried within the Earth's crust. 

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