1. The Oxygen Cycle

2. Photosynthesis The process by which light energy is converted to chemical energy

3. Plants The oxygen cycle starts off in plants. Plants use photosynthesis to produce carbohydrates and oxygen Plants “breathe” in carbon dioxide and “breathe” out oxygen

4. Water When the water in a steam enters a pond, microorganisms in the pond begin to break down organic matter, consuming oxygen in the process.

5. Organism Last in the cycle are the organisms Their role in the cycle begins with carbon dioxide in the atmosphere. Animals breathe that oxygen and both plants and animals use the sugars for energy.

6. Weathering Physical and chemical process in which solid rock exposed at earths surface is changed to separate solid particles and dissolved materials

7. Respiration & Decay Mechanisms in which animal life and bacteria consume oxygen and release carbon dioxide

8. Burial Photolysis The oxygen left inside of people after they have been buried in the ground gets absorbed by the soil. The chemical decompositi on of materials under the influence of light