Prehistoric World, Madden Gainer

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Across
  1. 3. what period did the earth look like it is now
  2. 4. how many periods are in the Carboniferous period in the U.S.
  3. 7. how much C02 was there in the beginning of the earth
  4. 9. how old is the earth
  5. 10. how many periods are there in the Palaeozoic age
  6. 11. how many layers are in the earth
Down
  1. 1. how many dino types are there
  2. 2. what percent of fish did the meteor wipe out
  3. 4. what was the largest plant type called in the Triassic period
  4. 5. what continent did humans evolve from
  5. 6. what modern day country did the meteor hit that made the dinos extinct
  6. 8. what are bones of deceased animals called