Answer:
RIdge, trench, abyssal plain
Explanation:
The evidence is when there is degradation. it is characteristic of channel networks in which either bedrock<span> erosion is taking place, or in systems that are </span>sediment<span>-starved and are therefore entraining more material than is being deposited. When a stream degrades, it leaves behind a </span>fluvial terrace<span>. This can be further classified as a </span>strath terrace<span>—a bedrock terrace that may have a thin mantle of </span>alluvium<span>—if the river is incising through bedrock.</span>
The main idea of this paragraph is A
The drawing of the boundaries in the manner of the interest of the European colonial powers resulted in very big problems once the African countries were granted independence.
The problems were mostly because people from the same ethnic groups were separated by borders, but were in the same ones with people from other ethnic groups, usually historical rivals with whom they had bad relations. Also, the religious factor had a big influence, as there were multiple countries were some parts were predominantly of one religion, and other parts of other religion, and that brought in even more tensions.
That has resulted in instability, constant tensions, civil wars, terrorist organizations, separatist movements, genocides, pretty much everything that is not supposed to happen for a country to prosper.
