41.   Under normal conditions, air rises as it heats.

42.   Warm air rises because it weighs less than cool air, just as a hot-air balloon rises.

43.   Warm air does rise.

44.   Warm, incoming Pacific air must rise up and over the blocking front.

45.   When moist air rises it is more likely to yield precipitation.

46.   With the roof gone, the air inside rose to join the sky.

47.   The warming waters cause moisture-laden air to rise, dramatically altering global wind and rainfall patterns.