Across
- 2. increases in the temperature of Earth's atmosphere and oceans
- 4. when all the trees in a large area are cut down
- 8. a type of animal which does not now exist
- 9. the weather conditions that an area usually has
- 12. a layer in the atmosphere that protects the Earth from dangerous radiation from the Sun
- 14. a type of energy that can produce light and heat, or make machines work
- 16. a reason for something to happen
- 17. containing poison
Down
- 1. energy, as solar or wind energy, that can replace traditional sources, as coal, oil, and natural gas
- 3. the number and types of plants and animals that exist in the world
- 5. a form of energy that can be produced as quickly as it is used
- 6. to keep someone or something safe from something dangerous or bad
- 7. a forest with a lot of tall trees where it rains a lot
- 10. damage caused to water, air by harmful substances
- 11. a car which has a normal petrol or diesel engine with an electric motor
- 13. when paper, glass, plastic can be used again
- 15. dioxide a gas that is produced when people and animals breathe out