Across
- 4. wind, water, geothermal, solar, and biomass
- 7. a substance that cannot be broken down
- 8. just before a ball lands, it has most __ energy
- 9. the variable that is being measured in an exp.
- 11. protons,neutrons,and electrons are __ particles
- 15. heat energy is also called ___ energy
- 17. the atomic number (top #) tells us how many ____
- 18. nearly all energy on earth originates from this
- 19. compounds are held together by _____
- 20. subatomic particle with no charge
Down
- 1. the variable that I change in an experiment
- 2. light energy is also called ___ energy
- 3. fossil fuels are what type of energy source
- 5. contains the protons and neutrons
- 6. subatomic particle that has a negative charge
- 10. appliances that plug in use ___ energy
- 12. the building blocks of all matter
- 13. two or more elements bonded together chemically
- 14. energy a bike has sitting at the top of a hill
- 16. reducing energy use