Global System

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Across
  1. 3. process of recycled soil, water, living things and the atmosphere
  2. 5. thick subsurface layer of soil that remains below freezing point throughout the year
  3. 6. area of forests or trees
  4. 7. capable of being renewed
  5. 8. condition in the atmosphere
  6. 10. warming of the Earth caused by greenhouse gases
  7. 12. electromagnetic waves or high-energy particles which cause ionization
  8. 13. main constituent of natural gas
  9. 15. when organisms use sunlight to synthesize nutrients
  10. 16. contain carbon of plants and animals that died
  11. 18. water which collects as droplets on cold surface when humid air is in contact
  12. 20. extreme of the Southern Oscillation that causes drought in parts of Australia
  13. 21. interacting organisms and their physical environment
Down
  1. 1. living things on Earth
  2. 2. water on the earths surface
  3. 3. weather condition
  4. 4. used in photosynthesis, gas
  5. 9. for the 'global conveyor belt'
  6. 11. land masses on Earth
  7. 14. symbol 'N'
  8. 17. radiation that cannot pass through glass
  9. 19. gas surrounding the Earth