Global Systems Crossword

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