Across
- 1. height of a wave
- 4. wave that is able to move through a vacuum
- 5. this happens to light wave when it passes from a gas to a liquid
- 9. wave that requires matter to travel
- 12. light bounces off at an angle
- 14. where convection currents occur
- 17. made of the crust and upper mantle
- 19. responsible for Earth's magnetic field
- 20. light bends as it changes media
- 21. state of matter of the outer core
Down
- 2. all light is able to pass though it
- 3. some light passes through but it is diffused
- 6. distance from crest to crest or trough to trough
- 7. state of matter through which longitudinal waves like sound travel the fastest
- 8. made of iron nickel, most dense compositional layer
- 10. no light can pass through it
- 11. highest point of a wave
- 13. rocky, least dense compositional layer of the Earth
- 15. the reason why the sky is blue
- 16. calculated by dividing mass by volume
- 18. lowest point of a wave