AIR

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Across
  1. 2. The gas a flame needs to keep burning; without it, the flame goes out
  2. 6. A poisonous gas from car exhausts that stops blood from carrying oxygen.
  3. 9. How living things (plants and animals) get energy, releasing carbon back into the air.
  4. 10. The emergency warning level for air pollution when the index goes above 300.
  5. 12. Rain made acidic by factory pollution, which damages buildings and metal.
  6. 13. A method using a fire blanket to cut off the air supply to a flame
  7. 14. The most abundant gas in the air that plants cannot absorb directly from the atmosphere
  8. 16. A material used for oil fires because it floats on top and blocks oxygen.
  9. 17. How water puts out a fire by absorbing the heat from burning objects
  10. 18. The scientific term for burning, which stops if you remove fuel, heat, or oxygen.
Down
  1. 1. Planting many trees to help the Earth absorb extra carbon dioxide.
  2. 3. Using natural predators (like ladybugs) to protect crops instead of using chemicals.
  3. 4. When tiny organisms break down dead plants and animals, releasing carbon back into the cycle.
  4. 5. physical way to separate different gases from liquid air by using different boiling points.
  5. 7. A very light, safe gas used in balloons because it is not flammable.
  6. 8. A gas that doesn’t react, used inside light bulbs to stop the filament from burning up.
  7. 10. Air pollution that blocks sunlight, making it hard for crops to grow.
  8. 11. The natural process that plants use to take in carbon dioxide and release oxygen.
  9. 15. Gases once used in fridges that were banned for damaging the ozone layer.