year 8

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