What are rocks made of ?
Rocks are made up mostly of crystals of different kinds of minerals, or broken pieces of crystals, or broken pieces of rocks. Some rocks are made of the shells of once-living animals, or of compressed pieces of plants.
Here is some links to check out what rocks can be made out of. http://geomaps.wr.usgs.gov/parks/rxmin/rock.html http://www.rocksforkids.com/RFK/howrocks.html
Here is some links to check out what rocks can be made out of. http://geomaps.wr.usgs.gov/parks/rxmin/rock.html http://www.rocksforkids.com/RFK/howrocks.html
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