Sedimentary Rocks

Sedimentary rocks are formed in rivers, lakes, oceans or deserts. Many of these rocks form when sand, small pieces or rock, or mud are pressed together to form layers of sediment. These layers of sediment are pressed together over a long period of time and form a sedimentary rock, such as sandstone. Other sedimentary rocks form through chemical precipitation, such as limestone. These rocks makes great small gifts for avid collectors.

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