Across
- 2. A large natural flow of water.
- 5. Some people who lived in Mesopotamia.
- 7. When people have developed effective ways of organising society.
- 8. Produces a large amount of something e.g plants.
- 9. People or groups working together.
Down
- 1. A country ruled by a king or a queen.
- 3. The quality of something that is not easily changed.
- 4. A length of time.
- 6. The big river in Egypt.
- 7. Shaped like the moon when it is less than half full.