Across
- 1. The gas we breathe in
- 3. What bees collect from flowers
- 4. The organ that pumps blood
- 5. How fast something moves
- 9. Animals without backbones
- 10. What plants need from the sun
Down
- 2. The center of an atom
- 6. The planet we live on
- 7. A push or pull
- 8. Frozen water