Science

5. The colored, ring-shaped membrane of the eye that surrounds the pupil and controls how much light enters.
6. The strength of the pull of gravity on an object
7. How fast or slow a light or sound wave is moving
10. Audible energy (energy you can hear)
11. a space entirely or mostly empty of matter, such as air or gas
13. Graph that shows change over time.
15. The amount of matter in an object
16. makes things visible to the human eye

1. A fact you gather using your 5 sense
2. How high or low a sound is
3. The thing that changes because the height of a sound wave
4. A guess or hypothesis
7. a push or a pull
8. the clear, dome-shaped outer layer at the front of the eye that covers the iris and pupil
9. The dark, circular opening in the center of the colored part of the eye
12. Reflection/bouncing of a sound wave
14. the force that holds the planets in orbit; pulls things towards the Earth