Prehistoric Life

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Across
  1. 5. Era known as the “Age of Ancient Life”
  2. 6. Period marked by extensive glacial coverage
  3. 7. Large, woolly relative of the elephant from the Ice Age
  4. 11. Where early life on Earth began and evolved
  5. 12. Group of cold-blooded animals that includes snakes and lizards
  6. 16. Powder left after something burns, often found near volcanoes
  7. 18. Era known as the “Age of Reptiles”
  8. 19. Fossilized tree resin, often containing prehistoric insects
  9. 20. The planet where continents formed and life began
Down
  1. 1. To turn organic material into stone, as in fossil formation
  2. 2. Geological period known for a major explosion in biodiversity
  3. 3. Large, slow-moving sheet of ice, common during the Ice Age
  4. 4. Prehistoric period known for early human tool use
  5. 8. Group of animals related to humans, including chimpanzees
  6. 9. Preserved remains or traces of ancient organisms
  7. 10. Giant reptiles that ruled the Earth during the Mesozoic era
  8. 13. Group of mammals that includes early humans and apes
  9. 14. Geological feature that helped shape early Earth’s landscape
  10. 15. Remains found from ancient animals that are preserved in rock
  11. 17. Hard outer covering, often fossilized, like in ancient sea animals