Across
- 3. A gas we exhale.
- 5. A force.
- 7. Protects the spinal cord.
- 8. A push or a pull.
- 9. Most basic building block.
- 10. A state of matter.
- 11. A liquid.
Down
- 1. Scientific name of skull.
- 2. pumps blood.
- 4. A gas we inhale.
- 6. A chemical reaction.
- 7. Water in the form of gas.