1. NITROGEN CYCLE

2. BACTERIA
Nitrogen fixing bacteria convert nitrogen gas into compounds like ammonia that plants can use in the soil.
Nitrifying bacteria change most of the ammonia in to more useful compounds called Nitrates
Denitrifying bacteria breaks down nitrates into Nitrogen Gas which is returned to the atmosphere.

4. CARBON CYCLE

5. What happens to Carbon in the Atmosphere?
Carbon dioxide is dissolved into ocean water where it is used by organisms to make CaCO3 (sea shells)
Carbon is absorbed by plants on land and in water through the process of photosynthesis

6. What happens to carbon in organisms?
CaCO3 settles to the bottom of the ocean floor where it turns into carbonate rocks. These rocks will eventually rise to the surface and be weathered.
Plants and animals die and are buried eventually turning into fossil fuels such as coal and oil.

7. How does carbon get released back into the atmosphere?
Respiration of plants and animals on land
Respiration of plants and animals in water
Weathering of carbonate rocks
Volcanic Activity
Burning of fossil fuels
Burning of plant material
Decomposition of plant material

9. WATER CYCLE

10. WATER CYCLE Evaporation - sends water vapor into the atmosphere
Condensation turns water into clouds
Precipitation water falls from clouds
Runoff – rain falls & runs into body of water
Infiltration – water soaks into the ground and is absorbed into
Groundwater – reservoirs of water stored beneath the earth’s surface