As temperatures approach -40 o C, water vapor in the air rapidly condenses into trillions of cloud droplets which immediately freeze and grow into tiny ice crystals.
(As temperatures approach -40 o C, water vapor in the air; rapidly condenses; into trillions of cloud droplets) (cloud droplets; freeze; T:immediately) (cloud droplets; grow; into tiny ice crystals)
As temperatures approach -40 o C, water vapor in the air cloud droplets cloud droplets
rapidly condenses freeze grow
into trillions of cloud droplets
T:immediately
into tiny ice crystals