Which of the following happens when sediment is blown up against a obstacle and settles behind it.
A = eskers
B = loess
C = dunes
D = till
I think C = dunes
Plz help
To determine the correct answer, let's understand the process involved when sediment is blown up against an obstacle and settles behind it.
When sediment is carried by wind and encounters an obstacle, such as a rock or a hill, it slows down and loses its momentum. The heavier particles within the sediment settle out and are deposited behind the obstacle.
With this information, let's analyze the given options:
A) Eskers are long, winding ridges of sediment formed by glaciers and not by wind-blown sediments.
B) Loess is a fine-grained, wind-blown sediment, but it is typically deposited across large areas rather than behind individual obstacles.
C) Dunes are indeed formed by wind-blown sediments, but they are not typically associated with obstacles. Dunes form in open areas where sediments accumulate due to wind deposition.
D) Till refers to unsorted sediment that is directly deposited by glacial ice and is not related to the process described in the question.
Based on the analysis, the most appropriate answer is D) Till. When sediment is blown up against an obstacle and settles behind it, it is typically referred to as till deposition.
Therefore, the correct answer is D) Till.