What is one reason why rock layers are not horizontal?

This word for a bug or malfunction was popularized in the 1962 book into orbit by the mercury astronauts

What characteristic of the basin that feeds the congo river system affects movement in central africa? a. the center of the basin is a dense rain forest. b. it is the center of ethnic conflict in the area. c. wildlife on the savanna makes it too dangerous to travel. d. the basin is surrounded by desert.

Apex! which term describes the expanse of flat land in this photograph? (see picture) a.) mountainb.) plainc.) rift valleyd.) plateau