Across
- 2. A molecule without carbon needed for photosynthesis
- 8. Made from the remains of dead organisms, ____ fuels power many things we do.
- 9. A process that decreased the CO2 in the atmosphere
- 11. The ability to do work, can't be created or destroyed.
- 12. Cellular respiration releases ______ energy
- 13. An atom bonded with one or more other atoms
Down
- 1. The gases surrounding the planet
- 3. Created by photosynthesis
- 4. Many trees are cut down to make land for...
- 5. Used for photosynthesis
- 6. Cutting down trees
- 7. Anything made of atoms
- 10. The energy needed for photosynthesis