The earth’s atmosphere a. thins as elevation increases. b. thins as elevation decreases c. stays the same at all elevations. d. thickens during solar equinoxes

The images show two different fronts.which fronts are shown? item a shows a cold front, and item b shows a warm front.item a shows an occluded front, and item b shows a cold front.item a shows a warm front, and item b shows a stationary front.item a shows a stationary front, and item b shows an occluded front.