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