The stone ages

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Across
  1. 3. ages long periods of freezing weather
  2. 5. to make fire and tools
  3. 7. nuts to survive
  4. 8. as saws and drills
  5. 10. make them more useful to humans
  6. 12. the creation of smaller and more
  7. 14. first used stone tools
  8. 15. era the new stone age;when people
  9. 16. bridge a strip of land connecting two
  10. 18. tools
  11. 19. a relative who lived in the past
Down
  1. 1. the process of changing plants or animals
  2. 2. to move to a new place
  3. 4. Huge stone monuments
  4. 6. the time before there was writing
  5. 9. people who hunt animals and gather wild
  6. 11. era the first part of the stone age,when
  7. 13. era the middle part of the stone age,marked
  8. 17. an early ancestor of humans