Weather

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Across
  1. 3. the noun from the adjective hot
  2. 4. cloudy and dark weather before the storm
  3. 6. the smallest part of something, consists of atoms
  4. 7. water that falls from the clouds
Down
  1. 1. a detailed study of some subject
  2. 2. the layer of gases around the Earth
  3. 5. a measurement of how much water there is in the air