The Nitrogen Cycle
Across
- 4. - the part of the cycle where ammonia is turned into nitrites and nitrates by bacteria in the soil.
- 8. - a type of bacteria that turns ammonia into nitrites
- 9. - a type of bacteria that turns nitrites into nitrates
- 11. - nitrogen fixing bacteria that have a symbiotic relationship with legumes
- 12. - when the fertilizer runoff from farmland causes algae and phytoplankton to multiply. These are also known as “algae blooms”, and creates a positive feedback loop in which the body of water continues to be a dead zone.
Down
- 1. - the part of the cycle where usable nitrogen is removed from the soil by microorganisms in the soil. This is necessary to balance the amount of nitrogen in the ecosystem.
- 2. - the part of the cycle where bacteria turn nitrates back into nitrogen gas for it to return to the atmosphere.
- 3. - a form of nitrogen which plants can consume. It is made when ammonia is mixed with water
- 5. Bonded - the type of bond that nitrogen atoms have in gaseous form.
- 6. Fixation - the part of the cycle where the nitrogen gas in the atmosphere is broken down by certain bacteria in the soil to be usable for plants.
- 7. - nitrogen fixing bacteria that lives “on its own” in the soil
- 10. - the part of the cycle where the nitrogen in plants and animals is broken down by decomposers to make ammonia.