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Text File  |  1992-09-03  |  215b  |  8 lines
  1. Rock is a constituent of the Earth's crust, 
  2. composed of mineral particles and/or 
  3. materials of organic origin consolidated into 
  4. a hard mass as igneous, sedimentary, or 
  5. metamorphic rocks. 
  6.  
  7. Subject by: Vince Pike
  8.