Across
- 5. An area on the surface and atmosphere of the planet occupied by living organisms
- 7. A radio wave of wavelength above 1km
- 8. A fuel obtained from living matter
- 12. Able to be renewed.
- 14. A thick subsurface layer of soil that remains below freezing point throughout the year, occurring mainly in polar regions
- 15. The production and discharge or gases
- 16. The process by which green plants and some other organisms use sunlight to synthesize nutrients from carbon dioxide and water
- 19. Combined processes which include photosynthesis, decomposition and respiration have carbon as a component
- 22. It refers to the flow of ocean water caused by changes in density
- 25. Electromagnetic radiation having a wavelength just greater than that of the red end of the visible light spectrum
- 26. A biological "community of interacting organisms" and their physical environment
Down
- 1. A rare and complex series of climatic changes affecting equatorial Pacific region
- 2. A layer/ sheet of frozen water covering and extensive area of land for a long period of time
- 3. The weather conditions in an area in general or over a long period.
- 4. The clearing of trees, transforming a forest into cleared land.
- 6. A unreactive colourless, odourless gas that forms about 78 per cent of the earth's atmosphere.
- 7. The rigid outer part of the earth which consists of the crust and upper mantle
- 9. A trapping of the sun's warmth in the planets lower atmosphere
- 10. A colourless, odourless gas which is produced by burning carbon and organic compounds
- 11. An area of gases surrounding planets
- 13. The changing of liquid into a gas. e.g. water from the oceans and be evaporated
- 17. The time relating to a period of "milder climate" between two glacial periods
- 18. Water which collects as droplets on a cold surface when humid air comes into contact with the surface
- 20. A natural fuel such as coal or gas which is formed from the remains of living organisms
- 21. The state of the atmosphere at a particular place and time. e.g. heat, cloudiness, dryness, sunshine, wind, rain, etc.
- 23. 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
- 24. The energy and heat which is radiated from all objects
- 27. A colourless, odourless flammable gas which is the main part of natural gas