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."
Southern and South-eastern
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.")
Yes. Very crowded.
Its VERY crowded
The room is crowded.
Diffusion
Yes, crowded is the correct spelling.
That is the correct spelling of crowded (congested, cramped).