No the South is not crowed
It is uncrowded.
The cities are crowded so there are a lot of buildings and factories which cause pollution.
Crowded
The comparative form of "crowded" is "more crowded."
Yes. "Crowded" can be a verb (as in "People crowded the stadium") or an adjective. (as in "The stadium was crowded because of all the people.")
Southern and South-eastern
Its VERY crowded
Yes. Very crowded.
The room is crowded.
Diffusion
That is the correct spelling of crowded (congested, cramped).
Is coach too crowded