Across
- 3. this type of magnet can be turned on and off
- 5. these can be an insulator or a conductor
- 7. occurring naturally or in several forms
- 9. is relatively weak compared to other fundamental forces
- 11. systems pick up sound echoes coming from objects under water
- 13. is caused by static electricity building up in clouds
- 15. heat transferred by the motion of hot gas or liquid
- 18. the force between molecules at the surface of a liquid
- 19. is the rate of doing work
Down
- 1. the energy from movement
- 2. the key factor in any form of movement
- 4. non-crystalline solids
- 6. has a turning point and a pivot
- 8. forms when sunlight is split into different wavelengths by water droplets in the air
- 10. a solid that is less dense than air
- 12. a poor heat conductor
- 14. the average measure of energy within a substance
- 16. the densest solid that occurs naturally
- 17. is a viscous fluid that flows without breaking into droplets