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How is the importance of tributaries best understood in a river system?

Answer and explanation

Correct answer: They connect water sediment and catchment area to the main river

A tributary is a smaller river or stream that flows into a larger main river. Many tributaries together form a branching drainage network. They carry water from different parts of the drainage basin and may also transport sediment into the main river. In this way, they connect local catchment areas with the larger river system and increase the amount and spread of water reaching the main channel.

Option A is correct because it describes the role of tributaries in linking water, sediment, and catchment areas to the main river. Tributaries do not normally close the main river, and they are clearly connected with drainage. They also do not separate a river from the sea; that is unrelated to their function. Therefore the supplied answer correctly presents tributaries as branches that strengthen and organise a river system.

Related tags

TributariesRiver NetworkCatchment

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