Answer to Question 1
Tropical rain forest
Desert and desert shrub
Tropical deciduous forest
Savanna
Undifferentiated highland
Mediterranean scrub
Prairie and steppe
Answer to Question 2
Four patterns are notable: As America has urbanized its rural, agricultural heartland has been depopulated, with some exceptions based on commodity booms; its people have moved South and West; cities have revitalized and attracted more people; and socioeconomic divides have widened within cities, forcing the relocation of poorer residents.