Across
- 2. when farming produces more food than needed
- 3. an invention that made trade rates increase
- 6. old stone age
- 7. a type of metal
- 8. when people or people move to a new reigon
- 9. top of social classes
- 10. ranks
Down
- 1. when humans adapt plants or animals for their own use
- 4. new stone age
- 5. to cross or mix two different types