Weather

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Across
  1. 3. When volume increases, air molecules __________.
  2. 5. anything that has mass and takes up space.
  3. 7. an instrument used to measure air pressure.
  4. 8. the amount of matter in an object or sample.
  5. 9. When volume decreases, air molecules __________.
  6. 10. a gas that makes up about 21% of earth's atmosphere.
  7. 12. the amount of mass in a sample of matter compared to its volume.
  8. 13. an instrument that measures thermal energy as temperature.
Down
  1. 1. a space containing no matter, not even air.
  2. 2. air pressure at ______ _______ is higher than it is at the top of a mountain.
  3. 4. air pressure ___________ as elevation increases.
  4. 6. the layer of gases around the earth.
  5. 11. prevents gravity from attracting air particles to the ground.