are spinning columns of air that cause random patterns of dark streaks on Mars’ surface. Hurricanes
Blizzards
Dust devils
Tornadoes
(Apologies for picking the wrong subject, there was no Astronomy category)

The electric field between square plates of a parallel-plate capacitor has magnitude e. the potential across the plates is maintained with constant voltage by a battery as they are pulled apart to twice their original separation, which is small compared to the dimensions of the plates. the magnitude of the electric field between the plates is now equal to a)e b)e/4 c)e/2 d)4e e)2e