Difficulty: Medium

Average Score: 69%

Which scenario demonstrates deposition?

Rationale

A pile of debris, including rocks and vegetation, forms at the bottom of a steep hill over time.

This scenario illustrates deposition, where materials are added to a landform, accumulating over time as they settle from water or gravity. The formation of debris piles at the base of a hill signifies the process of sediment being deposited after being eroded from higher elevations.

A (A rain-induced mudslide removes a significant amount of the vegetation and soil from a hillside.) YOUR ANSWER

This scenario describes erosion rather than deposition. Mudslides actively transport materials down a slope, removing soil and vegetation rather than accumulating them in a new location. The focus here is on the loss of material from the hillside, which contrasts with the concept of deposition.

B (A small river carves a deep canyon in limestone rock over a long period of time.) YOUR ANSWER

This situation illustrates erosion as well, where the flowing water of the river wears away the rock to create a canyon. The process involves the removal of material from the landscape, emphasizing the transformative power of moving water rather than the settling of materials characteristic of deposition.

D (The roots of a tree on a creek bank are exposed over time due to the flow of rainwater toward the creek.) YOUR ANSWER

This example also represents erosion, as the flowing water gradually removes soil from around the tree's roots. The exposure indicates the loss of material due to water flow, which does not align with the accumulation of sediments associated with deposition.

Conclusion

Deposition is defined as the process through which materials are added to a landscape, resulting in the formation of new geological features. In this question, option C presents a clear example of deposition, as debris accumulates at the base of a hill over time. The other options focus on erosion processes that involve the removal and transport of materials, highlighting the distinction between these two fundamental geological processes.

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