- a. Air near the equator is heated and rises until it hits the stratosphere where
- further heating ceases.
b. Air below pushes the stratospheric air outward, north and south.
c. Once the air hits the stratosphere it continues cooling as it flows north and south.
d. At some point it cools enough to begin to sink.
e. As it sinks, it warms and picks up water vapor, drying the environment.
f. This occurs around 30o latitude, north and south.
The entire process is repeated at 60o