Materials: Paper, pencil, crayons, constructional paper, magazines.

Procedure:
1. You have to draw or make a model for each of the following cycles: Water Cycle, Nitrogent Cycle, and Carbon Dioxide-Oxygen Cycle.
2. For each cycle label all the key processes.
3. Make sure to label the source of energy for each cycle.
4. Wherever possible show the organisms that are involved.
5. Use the rest of this paper to write your conclusions about each of the cycle.

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© Ms. Fleyshgakker 2002