Across
- 3. something we do all the time and everywhere we go
- 5. a good science experiment is ________
- 8. the letter H in H2O
- 10. when plants take in carbon dioxide and release oxygen
- 11. to take in
- 12. sunlight, water, and soil are needed for ______ to grow
Down
- 1. a chemical that plants need to grow, N on the periodic table
- 2. another name for H2O
- 4. the letter C on the periodic table
- 6. what humans need to breathe
- 7. what is happening to our oceans because of CO2
- 9. when animals take in oxygen and release carbon dioxide