the reasoning here is that with little exposed water, there will be little evaporation in these areas that could provide water vapor necessary to form clouds -- all of the water vapor has to come from sublimation or as imported moisture from lower latitudes.
(the reasoning here; is; that with little exposed water, there will be little evaporation in these areas that could provide water vapor necessary to form clouds -- all of the water vapor has to come from sublimation or as imported moisture from lower latitudes) (clouds; to come; from sublimation) (these areas; could provide; water vapor necessary)
the reasoning here clouds these areas
is to come could provide
that with little exposed water, there will be little evaporation in these areas that could provide water vapor necessary to form clouds -- all of the water vapor has to come from sublimation or as imported moisture from lower latitudes
from sublimation
water vapor necessary