QAGeography › Streams erode downward until they reach ________.

Streams erode downward until they reach ________.

A. their base level

B. their profile

C. an oxbow

D. the floodplain


Answer: A. their base level

The base level is the lowest level in which running water can flow and is capable of eroding. The base level of a stream is the point where the running water has less velocity, which leads to decreased speed for the running water and reduced or zero erosion. A typical example of a base level is a lake into which a stream flows. The velocity of the running water from the stream reduces greatly as it comes in contact with a bigger water body.

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