Sunday, February 20, 2011

Igneous, Sedimentary, and Metamorphic Rocks

Igneous describes rocks that are produced under conditions involving intense heat. Examples include pumice, obsidian, and rhyolite.


Sedimentary describes rocks formed by the settling and packing down of material at the earth's surface and within bodies of water.  Examples include halite, gypsum, and limestone.


Metamorphic describes rocks are igneous or sedimentary rocks, which have been altered by high temperature, strong pressure or by a combination of these.  Examples include gneiss, slate, and marble.


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