# Repost: Science (Lilly)

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Written Communication - Lilly, Saturday, April 21, 2007 at 8:48pm
What one thing is required for a rock to be called a sedimentary?

Written Communication - Lilly, Saturday, April 21, 2007 at 8:52pm
I know that "sedimentary rocks are formed when chemical reactions, tremendous heat, and/or great pressure change existing rocks into new knids of rocks. These new rocks (metamorphic rocks)have physical and chemical properties that are usually quite different from the original rocks."

A sedimentary rock is made up of sand and stones that have been deposited. Check these sites for more information.

http://dictionary.reference.com/browse/sedimentary

http://www.fi.edu/fellows/fellow1/oct98/create/sediment.htm

http://en.wikipedia.org/wiki/Sedimentary_rock

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