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Text File  |  1992-09-02  |  325b  |  11 lines
  1. Sedimentary rock is formed by the 
  2. accumulation and cementation of deposits that
  3. have been laid down by water, wind, ice, or
  4. gravity. Sedimentary rocks cover more than
  5. two-thirds of the Earth's surface and
  6. comprise three major categories: clastic,
  7. chemically precipitated, and organic
  8. (or biogenic).  
  9.  
  10. Subject by: Shaun Jay
  11.