1. THE OXYGEN-CARBON DIOXIDE CYCLE.

2. Bellwork
Name one thing you already know about oxygen. Name one thing you already know about carbon dioxide.

3. In:
How is water related to oxygen?

4. Oxygen-Carbon Dioxide Cycle
Both are GASSES important to all living things.
Unlike water which always stays water, oxygen (O2) and carbon dioxide (CO2) convert back and forth as they cycle on the planet.

7. ANIMAL CONTRIBUTION
During respiration (breathing), animals inhale oxygen (O2) and convert it to carbon dioxide (CO2).

8. PLANT CONTRIBUTION
During photosynthesis (the process where plants make food for themselves) plants breathe in carbon dioxide (CO2) and exhale oxygen (O2).

9. DECOMPOSERS
Dead organic material contains carbon dioxide (CO2), so as decomposers break down the tissue, carbon dioxide is released into the atmosphere.

10. FOSSIL FUELS
Oil, Gas, Coal are examples. When these fuels are burned, they release carbon dioxide (CO2) and water (H2O) into the atmosphere.

11. Out
Fill out the diagram and glue into your “out” section.