Rivers play an important role on the earth, and we can't imagine what the earth would be like without rivers.
With a length of 6, 650 kilometers, the Nile is the longest river in the world. The Nile River has been the source of human civilization since ancient times. The Nile has two main branches—the White Nile and the Blue Nile. The White Nile starts from the Great Lakes region of East and Central Africa through Lake Victoria. The Blue Nile carries with it a lot of fertile soil which turns out to be very important to farming in Egypt.
The Amazon River is the world's largest river with a width of about 40 kilometers during the rainy seasons but about 10 kilometers wide when it is not flooded. The Amazon River has such a big water volume that it accounts for(占.....比例) more than 20% of all the world's fresh water—far more than any other river. The main Amazon River flows mostly through Brazil and Peru but its tributaries can also be found in many other countries.
It has a depth of about 250 meters. Its length is 4, 700 kilometers. The sources of the Congo River are in the highlands and mountains in the Eastern Africa Rift Valley. It's the second largest river in terms of water volume. The Congo River basin(盆地) is the catchments(流域，集水区) area of the Congo River. It lies in both north and south of the Equator, making its flow very stable as there are always some tributaries experiencing a rainy season at any time.
A. Some of them are worth mentioning.
B. The Congo River is the world's deepest river.
C. Do you know which is the deepest river in the world?
D. The Blue Nile originates from(发源于)Lake Tana in Ethiopia.
E. Without rivers, there would be no living life in and along them.
F. And it flows through the second largest rain-forests in the world.
G. Streams that begin in the Andes Mountains are its sources.
