The Congo and Niger rivers have interesting irregular courses, and instead of going just in a certain direction, they circle around big areas. This is due to the shape of the landscape, and also because of the types of rocks in the surrounding areas where these two rivers flow.
The shape of the landscape is crucial in the course of a river, since every river is moving through the lowest parts where there isn't obstacles, so these rivers have followed that pattern and it turned out to give them irregular course. Also, the types of rocks on their way are very important, so these rivers managed to get through the sediment rocks as they are easy to erode, but haven't been able to break through the igneous rocks that are much harder.
The correct answer is B. Wealthiest countries of South America.
Uruguay is well known as a small country which is found in South America and it is between Argentina and Brazil along Atlantic coast.
Both Argentina and Uruguay they experience subtropical climate which is in the region of Paranena.
Uruguay is being borded to Argentina. The two mountains which ranges in Argentina are Sierras de Cordoba and Cordillera de Lípez.
The largest country is France
