TITLE        INTRODUCTION        DETRITAL ROCKS        CHEMICAL ROCKS        BIOCHEMICAL ROCKS   

  ENVIRONMENTAL CLUES        CREDITS

WHAT IS SEDIMENT?

                        changing sediment to rock          sedimentary rocks record Earth's history                 

                 sedimentary rocks are an important resource          three groups of sedimentary rocks    

 

Sediment is loose, hard material lying on top of solid rock.   Sediment comes in many forms and sizes, and can originate from a variety of sources.   Detrital sediment is produced by the weathering and erosion of rocks exposed at Earth's surface.   Chemical sediment forms as minerals crystallize and settle from water that contains lots of dissolved particles.   Biochemical sediment accumulates as plants and animals die and their hard parts, such as skeletons and shells, are deposited on the ocean floor.

           detrital sediment                            chemical sediment                      biochemical sediment

      sedregolith2.jpg (15135 bytes)                      sedrocksaltandhalite2.jpg (17502 bytes)                   picture described in text

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