Across
- 3. Be able to maintain a certain rate
- 5. A process warming the earth’s surface
- 6. Power used for activation
- 7. A state of something
- 9. A clearance of trees
- 11. A natural source of energy
Down
- 1. Harmful substance into the environment
- 2. A catastrophe!
- 4. The degree of heat in a substance
- 6. A natural world
- 8. A time of intense difficulty or danger
- 10. To convert into reusable material
- 12. Environmental friendly