Across
- 1. The process of changing waste materials such as newspapers and bottles so that they can be used again.
- 5. A hydrocarbon deposit, such as petroleum, coal, or natural gas, derived from living matter of a previous geologic time.
- 6. Dangerous, especially to people's health or safety.
- 7. A sudden short period of very cold weather.
- 9. It develops industries or makes them more modern.
- 11. A type of animal or plant that may soon become extinct.
- 16. Energy or natural materials replace themselves by natural processes, so that they are never completely used up.
Down
- 2. The increase of trade around the world.
- 3. The situation when an animal, plant, or language no longer exists.
- 4. A mixture of decaying plants and vegetables.
- 8. A large machine like a windmill used for producing electricity from the wind.
- 10. Used about people who care about the environment.
- 12. The process of removing the trees from an area of land.
- 13. Also called: atomic power.
- 14. Capable of continuing for a long time at the same level, or using methods that do not harm the environment.
- 15. A piece of equipment that uses energy from the Sun.