Answer:
The three most important rivers areThe Indus River, the Gangus River and the Brahmaputra River.
A because it’s based on the environment and the society
An estuary is where salt water and fresh water meet. Estuaries are usually found at the edge of the coast, where the ocean water, or salty water, meets river, lake, any fresh water source, water.
A tributary is something completely different. It is a, usually smaller than the main river or lake, river/stream stemming off a bigger river or lake, or flowing into that river or lake.
There are many ocean currents that take warm water up to London, thus warming the air there.
