Hot Air Balloons

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Across
  1. 2. what is tied to a hot air balloon
  2. 6. some balloons are brightly
  3. 7. makes warmer
  4. 8. when something goes up
Down
  1. 1. high places
  2. 3. air that is lighter than cold air
  3. 4. when the burner is turned off the air
  4. 5. part of a machine that makes heat