Across
- 3. of conservation of energy No energy is created or destroyed
- 6. Humans do it by moving
- 8. stored energy that compresses and stretches
- 9. How much matter is in a object
Down
- 1. comes from the sun
- 2. causes things to weigh down
- 4. Created in power plants
- 5. causes heat
- 7. Humans need it for energy