Across
- 2. A movement from one country or place to another
- 4. Human social development, People living around each other
- 7. Small artificial islands built on lakes
- 10. The southwest continent that connects to another
- 14. Outside, The trees and plants and animals
- 16. A picture writing system
- 18. A region of islands and coasts around this sea
- 19. Process of bringing water to plants to help them grow
- 20. Images/symbols related to something
Down
- 1. To form sloped land into multiple flat areas
- 3. A state that runs its own government
- 5. Wider land connection between separate areas
- 6. The name of the first people who lived in the Americas
- 8. Inca device that's used for recording information
- 9. An item important to one's culture
- 11. A theory assumed before the investigation
- 12. The first kind of book that's handwritten and made from sheets of paper
- 13. The northwest continent that connects to another
- 15. A theory about how the earth formed
- 17. picture characters carved into surfaces