Across
- 3. something that contaminates the environment.
- 6. long-term pattern of weather.
- 8. a kind of vibration through the earth's crust.
- 10. increase of temperature of Earth's atmosphere.
- 11. a series of events that are regularly repeated in the same order.
- 12. the release of volcano
- 14. synonym of 'sick'
- 15. complete disappearance of a species from Earth.
Down
- 1. an event or situation that causes something to start
- 2. the exterior of an object (ocean)
- 4. the action of clearing a wide area of trees.
- 5. physical harm that caused by something or someone.
- 7. the result of damage.
- 9. potential source of harm.
- 13. amount of force