The hydrosphere plays an important role in defining regional climates. Which one of the following is NOT true of atmospheric precipitation events that influence hydrosphere conditions?

a. The greatest proportion of annual precipitation occurs in tropical latitudes
b. Mid-latitude extratropical cyclones move from west to east within Ferrel cells.
c. Hadley cell tropical cyclones move from east to west & some grow into hurricanes
d. Vast deserts form where a low pressure band causes frequent thunderstorms and flooding