Read the following excerpt from The Works of John Playfair (1822).What glacial landform is being described? "…For the moving of large masses of rock, the most powerful engines without doubt that nature employs are the glaciers….[Rock] fragments they gradually transport to their utmost boundaries, where a formidable wall ascertains the magnitude, and attests the force, of the great engine by which it was erected."

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The excerpt describes a glacial landform that marks the boundary of the glacier's movement and attests to its power. This is most likely a moraine, which is a ridge or mound of sediment that is deposited at the edge of a glacier as it moves and melts. The description of large rock fragments being gradually transported and a formidable wall being erected suggests the deposition of a moraine. Therefore, the best choice is D) Moraine.

Read the Following Excerpt from the Works of John Playfair