Across
- 1. action that reuses waste to care for the environment
- 3. defend someone
- 5. repetitive action in the week
- 8. incorporation of oxygen
- 10. 70% of the world
- 12. element we use to keep warm
- 13. difficult understanding
- 14. everything that surrounds us
- 15. degree of cold and heat of bodies
Down
- 2. species transformation process
- 4. Its evolution is important for the world
- 6. layer that covers the earth
- 7. garbage in nature
- 9. set of past experiences
- 11. biological system made up of living beings