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  1. Clay is a very fine-grained sedimentary
  2. deposit that has undergone a greater or
  3. lesser degree of consolidation. When 
  4. moistened it is plastic, and it hardens on
  5. heating, which renders it impermeable. 
  6. Clays have a variety of uses, some of which,
  7. such as pottery and bricks, date back to 
  8. prehistoric times.
  9.  
  10. Subject by: Russell Webb
  11.