Jymena's crossword puzzle

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Across
  1. 3. change in order to survive
  2. 4. what people in the future will call our time period
  3. 5. a traveling person without a home
  4. 7. the early part of human history
  5. 9. continent with hunter gatherers
  6. 11. the use of new ideas and tools to do work
Down
  1. 1. long periods of extreme cold on earth
  2. 2. made it easier for people to work together
  3. 6. northwest of jericho
  4. 8. could cook food,had light at night and provided warmth
  5. 10. a hard stone with sharp edges