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