Global Systems Crossword

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Across
  1. 3. All land masses on Earth.
  2. 5. When greenhouse gases warm the Earth.
  3. 7. A process where nitrogen cycles through non-living and living environments.
  4. 9. Preserved remains of organisms that are now dead.
  5. 11. All liquid water on the suface of the Earth.
  6. 12. Places on Earth where the soil or rock layer's temperature never goes higher than freezing point.
  7. 14. Bacteria that absorbs nitrogen from air and then converts it to ammonia then nitrates.
  8. 17. A type of fuel that contains preserved plant and animal's carbon from millions of years ago.
  9. 18. When the Earth's climate changes
Down
  1. 1. Layers of gas that surround the Earth or a planet.
  2. 2. When the world's temperature average starts to increase.
  3. 4. The state of the atmosphere at a particular time or place.
  4. 6. When human activity causes an increase in the natural greenhouse effect.
  5. 8. When the ocean currents show a circular pattern in the major ocean basins.
  6. 10. Amount of time between glaciations.
  7. 13. The movement of Ocean water on a continuous basis.
  8. 15. All living things on Earth.
  9. 16. When carbon is recycled through water, soil and living things