science extra credit

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Across
  1. 1. change in form or apperance
  2. 5. combination of different substances
  3. 6. burning of fuel in presence of oxygen
  4. 7. enters into a chemical reaction
  5. 8. movement within a fluid
  6. 10. soild particules that become airborne
  7. 13. made up of only carbon and hydrogen
  8. 14. is uniform throughout
  9. 16. air pollutant formed when nitrogen oxides and hydrocarbon fue molecules are activated by UV rays
  10. 18. isn't uniform throughout
  11. 19. process of glucose and oxygen as inputs and carbon dioxide,water,energy as outputs
Down
  1. 1. formed by chemical reaction
  2. 2. change in combustion, also known as chemical reaction
  3. 3. weather condition,prevents convection
  4. 4. matter made up of a single molecule
  5. 9. transform light energy into chemical energy
  6. 11. reacts with oxygen to produce light and heat
  7. 12. Volatice Organic Compunds
  8. 15. a gas made up of three oxygen molecules
  9. 17. forms as a product of combustion