Air around us

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Across
  1. 2. Instrument that measures wind speed
  2. 7. A line that you draw from left to right
  3. 9. To organize something from big to small
  4. 11. Warm air is __________ then cool air
  5. 13. Also a harmful effect accompanied by strong winds
  6. 14. The air is made up off nitrogen, _________ and carbon dioxide
  7. 15. It is an instrument that measure the wind direction
  8. 16. A harmful effect of wind is soil _________
  9. 17. Process by which plants produce their own food
Down
  1. 1. A line from top to bottom
  2. 3. Also called moving air
  3. 4. It is a characteristics of air when air is pressed into an object
  4. 5. Sound is transmitted through the _________ of sound
  5. 6. The layer of air around the Earth
  6. 8. Something that has mass and takes up space
  7. 10. A harmful effect of the wind
  8. 12. Cool air __________