Nature and the environment

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Across
  1. 2. a tropical storm with very strong winds and heavy rain
  2. 4. the processes that make the air, water and earth dangerously dirty
  3. 7. a large area of trees
  4. 8. a mass of salt water that covers most of the Earth
  5. 10. a small, narrow river
  6. 11. a large rock mountain with very steep side
Down
  1. 1. a large area where tropical trees and plants grow closely together
  2. 3. a mountain that could erupt
  3. 5. a covering of gases in the sky that protects us from radiation from the sun (two words)
  4. 6. the area where the land and sea meet
  5. 7. a large quantity of water that covers land that is usually dry
  6. 9. the increase in the Earth's temperature is known as global ____