Across
- 2. The straight path light travels in
- 4. A reaction where heat is released
- 7. This food group gives quick energy
- 9. Too much sugar can cause this health problem
Down
- 1. A gas that makes drinks fizzy and is made during respiration
- 3. A device used to separate white light into a rainbow
- 5. What do we call a material that lets light through clearly?
- 6. Nutrient that helps build muscles
- 8. I have no mouth, but I help you burn food. I keep you alive, though you can’t see me. What am I?