SCIENCE

4. artificial source of sound
8. Energy a form of energy produced by vibrations that travel through materials or medium
10. chemical in our bodies that tells cells and bodies what to do.
11. can be found in the environment
14. the form of energy that is visible to the eye.
15. any flammable substance that produces heat when it is burned
16. is a form of energy that can build up in one place or flow from one object to another as it is carried through a wire.
17. is the form of energy that makes things hot

1. are quick, back-and-forth movements of the particles of an object, allowing the object to produce sound.
2. the ability of living organisms to produce light.
3. natural source of light
5. artificial source of light
6. natural form of heat energy that comes from deep within Earth.
7. empty, airless space
9. natural source of sound
12. made by humans
13. the main source of heat energy on Earth