Across
- 5. A piece of equipment that uses energy from the Sun.
- 7. Using methods that do not harm the environment.
- 9. The process of removing the trees from an area of land.
- 10. The situation when an animal, plant, or language no longer exists.
- 11. The process of changing waste materials.
- 12. A large machine like a windmill.
- 13. Dangerous, especially to people's health or safety.
- 14. Also called: atomic power.
- 15. It develops industries or makes them more modern.
- 16. The increase of trade around the world.
Down
- 1. Energy or natural materials replace themselves by natural processes.
- 2. A mixture of decaying plants and vegetables.
- 3. A sudden short period of very cold weather.
- 4. Derived from living matter of a previous geologic time.
- 6. Used about people who care about the environment.
- 8. A type of animal or plant that may soon become extinct.