Across
- 5. shows the number of valence electrons
- 6. the new chemicals formed by a reactant
- 7. protects against disease
- 8. The variety of all types of organisms living in a given area
- 10. a group of tissues layered together that work together
- 12. Carries sediments away
- 14. tiny rocks
- 15. provided support and red blood cell function
Down
- 1. a substance that takes part in and undergoes change during a reaction
- 2. water that does not soak into the ground
- 3. Breaks down sediments
- 4. drops the sediments
- 9. removes waste from the body
- 11. Determines the energy shells of an element
- 13. protects the body from the outside world