Takoda

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Across
  1. 7. gas that's like a greenhouse
  2. 8. continent moving
  3. 9. bone encased in rock
  4. 10. a giant calendar
Down
  1. 1. telling how old a rock is
  2. 2. breaking rocks
  3. 3. event killing dinosaurs
  4. 4. groups first men and women
  5. 5. decay of rock
  6. 6. gas that's produced by cattle