Global System

5. A colourless, odourless gas which is produced by burning carbon and organic compounds
7. Combined processes which include photosynthesis, decomposition and respiration have carbon as a component
8. A layer/ sheet of frozen water covering and extensive area of land for a long period of time
10. The clearing of trees, transforming a forest into cleared land.
13. A trapping of the sun's warmth in the planets lower atmosphere
16. All of the waters on the earth's surface, such as lakes and seas, and sometimes this includes water over the earth's surface, such as clouds
18. A radio wave of wavelength above 1km
19. A natural fuel such as coal or gas which is formed from the remains of living organisms
21. Water which collects as droplets on a cold surface when humid air comes into contact with the surface
24. It refers to the flow of ocean water caused by changes in density
25. A biological "community of interacting organisms" and their physical environment
26. An area on the surface and atmosphere of the planet occupied by living organisms
27. A thick subsurface layer of soil that remains below freezing point throughout the year, occurring mainly in polar regions

1. Electromagnetic radiation having a wavelength just greater than that of the red end of the visible light spectrum
2. The state of the atmosphere at a particular place and time. e.g. heat, cloudiness, dryness, sunshine, wind, rain, etc.
3. The process by which green plants and some other organisms use sunlight to synthesize nutrients from carbon dioxide and water
4. A colourless, odourless flammable gas which is the main part of natural gas
6. The production and discharge or gases
9. A rare and complex series of climatic changes affecting equatorial Pacific region
11. The time relating to a period of "milder climate" between two glacial periods
12. The weather conditions in an area in general or over a long period.
14. The changing of liquid into a gas. e.g. water from the oceans and be evaporated
15. The energy and heat which is radiated from all objects
17. Able to be renewed.
20. The rigid outer part of the earth which consists of the crust and upper mantle
22. A unreactive colourless, odourless gas that forms about 78 per cent of the earth's atmosphere.
23. An area of gases surrounding planets
26. A fuel obtained from living matter