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Environment &EcosystemsThe three main cycles in nature that 5th graders need to know are:
The Carbon-Dioxide Cycle
  The Nitrogen Cycle
Nitrogen is the most abundant element in our planet’s atmosphere.
Approximately 78% of the atmosphere is comprised of this important element.
 *Picture & Information Below is taken from: http://peer.tamu.edu/curriculum_modules/Environ_Hazard/module_1/lesson5.htm Step 1: A special type of bacteria called nitrogen fixing bacteria take in atmospheric nitrogen and produce ammonia (NH3). Step 3: The nitrates and nitrites are used by plants to make amino acids which are then used to make plant proteins. Step 4: Plants are consumed by other organisms which use the plant amino acids to make their own. Step 5: Decomposers convert the nitrogen found in other organisms into ammonia and return it to the soil. A few of these type of bacteria return nitrogen to the atmosphere by a process called denitrification, however this amount is small. The Water Cycle
 
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