Across
- 3. Condition where harmful substances exist in the air, water or on the planet in general.
- 4. Planting trees on forest areas where deforestation has occurred.
- 6. Process caused by human action that destroys the forest surface.
- 7. A phenomenon that causes the Earth's temperature to increase due to the actions of human.
- 9. A community of organisms that interact with their environment.
- 10. The variety of living species that live in an ecosystem.
Down
- 1. Energy sources that are naturally in renewal, such as solar or wind energy.
- 2. Non-domesticated animal species that live wild in an area without humans.
- 5. A natural space where living beings live.
- 8. A process whose objective is to convert used materials into new materials.