Weather Puzzle

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Across
  1. 2. A collection of small water droplets or ice crystals suspended in the air
  2. 4. The boundary between air masses of different densities and usually different temperatures
  3. 6. Sound caused by the rapid expansion of air along an electrical strike
  4. 9. Any form of water that falls to the Earth's surface from the clouds
  5. 10. A gradual increase in average global temperature
  6. 14. A measure of the force with which air molecules push on a surface
  7. 15. The movement of air caused by differences in air pressure
Down
  1. 1. The amount of water vapor in the air
  2. 3. streams A narrow belt of strong winds that blow in the upper troposhere
  3. 5. The transfer of energy as heat through a materal
  4. 7. Instrument used to measure wind speed
  5. 8. Mixture of gases that surround's Earth
  6. 11. Instrument that measures atmospheric pressure
  7. 12. The short term state of the atmosphere
  8. 13. The transfer of energy as electromagnetic waves