Charlies SS Crossword Puzzle

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Across
  1. 5. Any object that helps humans with work
  2. 7. The middle of the stone age
  3. 8. Farming
  4. 10. Humans
  5. 11. Early people who hunted and collected
  6. 13. The freezing point of the world a long time ago
  7. 15. The new stone age
Down
  1. 1. The first part of the stone age
  2. 2. A group of people who share the same culture
  3. 3. Changing a plant or animal to help a human with some type of work
  4. 4. Moving to a new place
  5. 6. Huge stones used as monuments
  6. 9. A time before writing
  7. 12. A long ago human ancestor
  8. 14. Bridge A strip of land connecting two continents