Explain the pressure gradient force, the Coriolis Effect and the

frictional force and their effects on the direction and speed of air at the

surface and aloft in the atmosphere.  Describe the wind and pressure systems

(surface and aloft) that exist in the zone from the Equator to the North

Pole in the Northern Hemisphere.  There is a close relationship between

atmospheric pressure patterns, wind zones and precipitation patterns.  The

global map of total annual rainfall shows great differences in precipitation

received from place to place.  Using at least 3 reasons, explain why this is so