Question

question 8
which of the following processes results in the lengthening of streams in the upslope direction?
delta progradation
the development of sheetwash
headward erosion
increase in the amount of suspended load sediment

Explanation:

• Delta progradation: This is the process of a delta (a landform at the mouth of a river) growing forward into a body of water (like a sea or lake). It causes the river to extend in the down - slope (towards the water body) direction, not up - slope.
• Development of sheetwash: Sheetwash is the thin, unconfined flow of water over the land surface. It is more related to the initial stages of erosion and sediment transport in a more widespread, non - channelized way and does not specifically cause stream lengthening in the up - slope direction.
• Headward erosion: Headward erosion is the process by which a stream erodes its source (the starting point of the stream channel) and causes the stream to grow or lengthen in the up - slope direction. As the stream erodes back into the hillslope or the area from which it originates, the length of the stream in the up - slope direction increases.
• Increase in the amount of suspended load sediment: An increase in suspended load sediment affects the sediment transport capacity and the sedimentation patterns within the stream (such as in the channel or at the mouth). It does not directly cause the stream to lengthen in the up - slope direction.

Answer:

Headward erosion