Another explanation is that finely divided dust offers more surface area than large particules
or rock, scattering more light and thus appearing brighter in color. Consequently, when
dust is sifted down a major storm, it brightens the areas where it lands. But later, when
local gusts scour the fine dust away, seasonal planet mars, underlying areas may apear dark again. Or perhaps varying wind speeds determine whether small brigh particles of heavy
drak aprticles will be oved in a given area.
THus, in either case, seasonal wind variations might account for seasonal changes in
brightness.
