7 - History of the Earth - VOCAB

123456789101112131415161718192021
Across
  1. 2. The bones in the mouth that help to bite and chew food.
  2. 9. The study of the past.
  3. 11. 1,000,000
  4. 13. The study of ancient life, especially fossils.
  5. 14. An animal with cold blood and a scaly skin, like a snake.
  6. 15. The remains of an ancient plant or animal preserved in rock.
  7. 16. Something that is new or has not existed for very long.
  8. 17. Something that shows what has happened in the past.
  9. 18. 1,000,000,000,000
  10. 19. 1,000,000,000
  11. 20. A small, six-legged animal with a hard outer shell.
Down
  1. 1. Something that has disappeared forever.
  2. 3. An animal that lives both in water and on land, like a frog.
  3. 4. An animal with hair that drinks milk when it is a baby.
  4. 5. A soft-bodied animal with a shell, like a snail or clam.
  5. 6. Science of the earth's land
  6. 7. Something that has existed for a long time.
  7. 8. The hard structures that support the body of animals.
  8. 10. The principle that younger rocks are usually found on top of older rocks.
  9. 12. Something confusing or difficult to understand.
  10. 21. A long period of time in history.