Across
- 2. the essential, clear, odorless, and tasteless liquid compound of hydrogen and oxygen
- 5. negative charge
- 6. a material characterized by its shiny appearance, ability to conduct heat and electricity, and malleability
- 8. the lightest and most abundant chemical element in the universe
- 10. he natural, gradual degradation of materials
- 12. makes up the world
Down
- 1. the mechanical wearing, scraping, or grinding away of a material's surface
- 3. has positive charge
- 4. has no charge
- 7. the invisible mixture of gases that makes up Earth's atmosphere
- 9. describes metal, usually iron or steel, that has been coated with a protective layer of zinc
- 11. a reddish-brown coating that forms on iron or steel when it is exposed to oxygen and moisture