When the air cools, the water vapor in the clouds condenses and falls as rain or snow.
(the water vapor in the clouds; condenses; T:When the air cools) (the water vapor in the clouds; falls; as rain or snow; T:When the air cools)
the water vapor in the clouds the water vapor in the clouds
condenses falls
T:When the air cools
as rain or snow T:When the air cools