Across
- 3. The boiling point of water in Celsius. (3 letters)
- 5. The process of making food in plants. (13 letters)
- 7. The chemical symbol for silver. (2 letters)
- 9. A shape with four equal sides and angles. (6 letters)
- 10. The natural satellite of Earth. (4 letters)
- 12. The hardest natural substance. (7 letters)
- 13. The largest land animal. (8 letters)
- 16. The fourth planet from the Sun. (4 letters)
- 17. A period of ten years. (5 letters)
- 18. The study of past events. (7 letters)
Down
- 1. The capital city of France. (5 letters)
- 2. The study of living organisms. (7 letters)
- 4. The gas we breathe in to survive. (6 letters)
- 6. The organ responsible for pumping blood. (5 letters)
- 8. A gas that makes up 78% of the air. (8 letters)
- 10. A solid form of water. (3 letters)
- 11. The planet closest to the Sun. (7 letters)
- 14. The study of numbers and shapes. (11 letters)
- 15. The branch of science dealing with stars and planets. (10 letters)
- 16. A tool used to measure weight. (5 letters)