Question

The longest river in the world is___.
(A) Nile
(B) Amazon
(C) Yangtze
(D) Missouri mississippi

Answer 1

Hint: Measuring a river is not as easy as it seems because many rivers merge into river systems, so sometimes it is difficult to pinpoint where one river begins. The most widely accepted method among scientists is to measure the length of the longest river channel in a given river.

Complete answer:
The Nile flows north through the tropical climate of eastern Africa and enters the Mediterranean Sea, the Nile River being the longest river in the world by 4,135 miles (6,650 kilometers), according to the U.S. National Park Service. The Nile River flows through Egypt, along with nine other African countries of Sudan, Eritrea, Ethiopia, Uganda, Kenya, Tanzania, Rwanda, Burundi and the Democratic Republic of Congo. More than 300 million people depend on the Nile for water supply and irrigation of annual crops, according to the Nile Basin Minister of Water Affairs. Nile power is used by Aswan High Dam, which was completed in 1970 and provides electricity and controls summer floods. In the 1980's, the dam supplied half of Egypt's electricity, although that number has dropped in recent years and currently provides 20 percent of the total energy produced in Egypt, according to NASA's Earth Observatory. The mouth of the river is difficult to define in cases where the river has a large lake that slowly rises into the sea. Some rivers have no mouth, instead they shrink to very low water levels and disappear underground. The river may have many channels, or anabranches, and it may not be clear how to measure the length of the lake.

Therefore, the correct option is (A)

Note: The "true source" of the river is considered to be the source of the most distant charge and mouth, but this canal may have the same name as the main main river. In addition, it is sometimes difficult to pinpoint exactly where a river originates - especially rivers formed by temporary streams, swamps, or changing lakes.