Global System

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Across
  1. 3. A radio wave of a wavelength above one kilometre
  2. 4. Capable of being renewed
  3. 7. All the liquid water on the Earth's surface
  4. 9. A layer of ice covering an extensive tract of land for a long period of time
  5. 10. Having a wavelength just greater than that of the red end of the visible light spectrum but less than that of microwaves
  6. 12. The land masses on Earth
  7. 13. Areas on Earth where the temperature in layers of soil or rock beneath the surface never rises above freezing point
  8. 17. An extreme of the Southern Oscillation that causes drought in parts of Australia
  9. 18. A colourless, odourless gas produced by burning carbon and organic compounds and by respiration
  10. 19. A colourless, odourless flammable gas which is the main constituent of natural gas. It is the simplest member of the alkane series of hydrocarbons
  11. 20. The warming of Earth caused by greenhouse gases
  12. 21. Periods between glaciations
  13. 24. The process of becoming a vapour
  14. 26. Fuels that contain the carbon of plants and animals that died and were preserved millions of years ago
  15. 27. The chemical element of atomic number 7, a colourless, odourless unreactive gas
Down
  1. 1. The long-term averages of weather conditions
  2. 2. The process by which carbon is recycled through the soil, water, living things and the atmosphhere
  3. 5. All living things on Earth
  4. 6. The conditions in the atmosphere
  5. 8. The production and discharge of something, especially gas or radiation
  6. 11. The state of being clear of trees
  7. 13. The process by which green plants and some other organisms use sunlight to synthesize nutrients from carbon dioxide and water
  8. 14. The term thermohaline circulation refers to a part of the large-scale ocean circulation that is driven by global density gradients created by surface heat and freshwater fluxes
  9. 15. The conversion of a vapour or gas to a liquid
  10. 16. A biological community of interacting organisms and their physical environment
  11. 22. The emission of energy as electromagnetic waves or as moving subatomic particles, especially high-energy particles which cause ionization
  12. 23. The layers of gasses surrounding the planet
  13. 25. A fuel derived immediately from living matter