Across
- 4. Energy Energy of motion.
- 8. Breaking down of matter by bacteria or fungi.
- 12. Reducing or getting rid of pollution.
- 13. A stage in a repeating cycle.
- 15. (Cd) A heavy metal that stays in the environment.
- 16. How much matter is in something.
- 19. To combine with oxygen or lose electrons.
- 20. How much gravity pulls on something.
Down
- 1. A number with size and direction.
- 2. A model or example of something.
- 3. How much a fluid resists flowing.
- 5. Energy given off as waves or particles.
- 6. A number with only size, no direction.
- 7. A big molecule made of repeating parts.
- 9. A curved shape from a quadratic graph.
- 10. A sperm or egg cell with half the genetic material.
- 11. The ability to do work.
- 14. A bright object at the center of a galaxy.
- 17. Hopeful or positive in a hard situation.
- 18. Energy Stored energy from position.