The geography of china
a. left it open to invaders.
c. kept it isolated.
b. made farming difficult.
d. encouraged sea and river trading. the geography of china
c. kept it isolated.

While viewing a topographic map, you notice a region in which the contour lines are very close together. what can you conclude about this region? a. it has a high population. b. it has a steep incline. c. it's near a political boundary. d. it contains a body of water.