Earth Science Review #3

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Across
  1. 2. produced by algae forming calcium carbonate
  2. 3. evolved in early Paleozoic era
  3. 6. 3rd layer where temp decreases with height
  4. 12. cell that lacks a nucleus
  5. 13. temperature increases;tiny fraction of mass
  6. 15. 2nd layer of atmosphere from ground
  7. 16. transfer of heat by molecular activity
  8. 17. transfer of heat through space by EM waves
Down
  1. 1. faulted struct of divergent plate boundaries
  2. 4. 2 sed rocks are sep by erosional surface
  3. 5. large ancient metamorphic rock within continent
  4. 7. using radioactive isotopes to det age
  5. 8. erosional surface sep older rock from young
  6. 9. the bottom layer of atmosphere
  7. 10. surface with a break in the rock record
  8. 11. June 21 or 22
  9. 14. chronological order of age determined
  10. 16. transfer of heat by movement of mass