Global Systems

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Across
  1. 4. a warm ocean current that flows along the equator
  2. 7. the daily temperatures
  3. 10. The emission of energy as electromagnetic waves
  4. 12. a radio wave longer than 1 kilometer
  5. 14. the cycle essential for living on earth
  6. 15. the process which green plants use to grow
  7. 17. a source of energy that is renewed
  8. 20. a permanent layer of ice covering land
  9. 23. a colorless odorless gas produced by burning organic compounds
  10. 25. Water that collects as droplets on a cold surface when humid air is in contact with it
  11. 26. A biological community of interacting organisms
  12. 27. the air surrounding the earth
  13. 28. when a gas is released into the air
Down
  1. 1. the weather conditions
  2. 2. gases produced by cows
  3. 3. A thick layer of soil which remains frozen throughout the year
  4. 5. below the temperature of -1
  5. 6. the density of the ocean
  6. 8. air is made up of 78% of this
  7. 9. when trees have been cleared away
  8. 11. the process of becoming a vapor
  9. 13. The trapping of the sun's warmth in a planet's
  10. 16. relating to a period of milder climate between two glacial periods.
  11. 18. A fuel that is taken away from living matter
  12. 19. the land
  13. 21. all the water on the earth surface
  14. 22. a natural fuel such as coal or gas which is millions of years old
  15. 24. all the parts of the earth surfaces and the earths atmosphere