Across
- 2. Small but exact copy of something
- 4. silver-colored material used to coat glass in order to make it reflective
- 8. an organ that has nerve endings that respond to stimulation
- 9. a material that does not allow light to pass through, not transparent
- 10. goes through
- 11. anything that makes light, whether natural and artificial
- 12. a measure of the amount of light reflected by a material
- 14. the only wavelengths of the electromagnetic spectrum that humans can see
- 15. variable that is changed
- 18. structure that carries electrical signals to the brain where they are processed it into what we see
- 20. a layer senses light and changes it into electrical signals that are sent to the brain
- 21. one of the ways that energy travels through space
Down
- 1. questions that are answered by conducting tests, and collecting evidence about a phenomenon or problem
- 3. a piece of glass that is a mirror on one side but that can be seen through like a window from the other side
- 5. variable affected by the change
- 6. bounces off
- 7. a representation we use to understand or describe phenomenon
- 13. a reflective surface that reflects a clear image
- 16. a behavior, that is agreed upon and expected of a group
- 17. a material that allows light to pass through so that objects behind can be seen
- 19. a piece of glass that can separate white light