Global Systems

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Across
  1. 3. Flammable gas which is present in natural gases
  2. 4. All the water surrounding or on the earth
  3. 6. The area on a planet occupied by organisms
  4. 7. State of having no trees in an area
  5. 9. Natural fuels formed from the past from remains or organisms
  6. 11. Relation of climates between two glacial periods
  7. 13. Trapping of suns warms in a planets atmosphere
  8. 17. Capable of being renewed
  9. 20. Water that converts from vapour to liquid
  10. 22. The process of turning to vapour
  11. 24. The surrounding gases around a planets surface
  12. 25. The warming of the tropical pacific every few years
  13. 26. The habitat in which certain organisms live in
  14. 27. Part of the invisible spectrum that is near the red end of the visible spectrum
  15. 28. A layering of ice covering a land for a long time
Down
  1. 1. State of the atmosphere at a particular time
  2. 2. A wave length longer than a kilometer
  3. 5. Process in which some plants use sunlight to create energy
  4. 8. Weather conditions in an area
  5. 10. The rigid outer of the earth
  6. 12. Part of large scale ocean circulation
  7. 14. Production of discharge of gas or radiation
  8. 15. Gas produced by burning carbon and via respiration
  9. 16. Process which Carbon is recyled
  10. 18. Derived from living matter
  11. 19. Emisson of energy as subatomic particles
  12. 21. An unreactive gas forming around eighty percent of earths atmosphere
  13. 23. Thick layer of soil below freezing points