Across
- 4. Something that is changeable, not constant
- 5. Necessary tools
- 7. Place used for scientific experiments and research
- 11. To examine
- 14. Instrument for measuring temperature
- 19. Degree of heat or cold
- 20. Space occupied by gas or liquid
Down
- 1. Being safe
- 2. Marked or gauged
- 3. Ending
- 6. Science of properties and interaction of matter and energy
- 8. Study of living organisms
- 9. Study of substances and their reactions
- 10. Finding a size or quantity
- 12. Taking notice
- 13. Something implied
- 15. A supposition made as a basis for reasoning
- 16. Curved surface of liquid
- 17. A large quantity, heap
- 18. Science of earth's crust