sedimentary+rock

=Sedimentary Rock- What is it?= Sedimentary rocks are actually layers of sediment, like sand and mud that have been compressed and cemented over a long period of time. Some examples of these types of rocks are sandstone, gypsum, limestone, and shale. Sedimentary rock make up approximately three fourths of the Earth's surface.

=History of Sedimentary Rock= (Topic Description - briefly describe who discovered or developed the theories involved, when and where these developments occurred)

=What are some of its uses?= Sedimentary rock like limestone, are used for highway construcution. Chalk is used to write on blackboards in schools. There are valuable energy-containing compounds in coal. Rock salt is used in chemical industries, and is even used for highway treatments during the winter months. Virtually all buildings require sedimentary rock in their construction.

=References=
 * 1) Beiser, A. (1988). //Physical Science (2nd Edition) //. New York, NY: McGraw Hill
 * 2) []
 * 3) (Ref #3 - from book, library, journal)

This WikiPage developed by Stephen Lee FALL 2011 Physical Science