Across
- 4. place where we live in
- 5. monkey to human is called?
- 7. develop earth and make it survivable
- 8. makes the atmosphere
- 9. place where we walk on
- 12. living things that produce oxygen
Down
- 1. reason for the melting of glaciers in the north pole
- 2. contains the layers of atmosphere
- 3. being able to develop and improve the place
- 6. causes the green house gases to increase
- 10. living things that depend on other beings for food
- 11. 75% of earth is made of this