Across
- 1. to move to a new place
- 3. the time before there was writing
- 4. a relative who lived in the past
- 5. an object that has been modified to help a person acomplish a task
- 7. era the middle of the stone age
- 8. an early ancestor of humans
- 10. the process of changing plants or animals to make them more useful to humans
Down
- 1. a huge stone monument
- 2. farming
- 3. era the first part of the stone age
- 6. bridge a strip of land connecting two continents
- 9. era the new stone age
- 11. ages long periods of freezing weather