Notice the intermittent stream that drains from the upstream end of the alluvial fan system A (that you have already colored yellow) to the playa at E. How would the grain size of the sediments along this stream change as you walk downslope from the highest part of the fan, up in the canyons, to the playa (E)? Why?

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The correct answer is

The grain size would get smaller. Because o the the distance between the two points.