Question

multiple select question
select all that apply
which happens to stream channels when runoff increases?
they get steeper.
they get longer.
they get wider.
they get deeper.
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Explanation:

When runoff increases, the erosive power of the water in the stream channel increases. This leads to the stream channel eroding more material. It can erode the sides (making it wider) and the bottom (making it deeper). The length of a stream channel is mainly determined by factors like the source - to - mouth distance and tectonic and base - level changes rather than just runoff increase. The steepness of a stream channel is related to the slope of the land it flows over and not directly to runoff increase in the sense that runoff increase doesn't make the channel itself steeper (the land slope is a separate factor).

Answer:

C. They get wider, D. They get deeper.