[REQUIRED] What type of glacier carves U-shaped features, like those seen at Yosemite National Park?

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BlackTom AI · Accepted Answer

Question restatement: The prompt asks which type of glacier carves U-shaped features, as seen at Yosemite National Park.
Option 1: Valley glaciers. These are the classic sources of U-shaped valleys in mountainous regions like Yosemite, formed by the glacial ice eroding the valley walls and floor as it advances and retreats. The distinctive U-shape is a hallmark of glaciation from valley glaciers.
Option 2: Ice sheets. Ice sheets are vast, thick ice masses that cover large continental areas (e.g., Antarctica, Greenland) and they erode landscapes on a much broader scale, typically creating broad, smooth, flat features rather than narrow U-shaped valleys. Their deposits and erosional patterns differ from the classic Yosemite-style valley carving.
Option 3: Underground glaciers. Also known as subglacial or englacial glaciers, these produce erosion at depth and can influence terrain in complex, localized ways, but they are not the standard culprits described when referencing the iconic U-shaped valleys of Yosemite. The surface expression is less typical for these formations.
Option 4: Ice rivers. This term is less conventional in geomorphology; glaciers do not typically get described as ice rivers. Glacial ice flows are components of the glacier system, but the label ice rivers does not correspond to a recognized primary agent of U-shaped valley formation, making it an incorrect framing for this feature.
In summary, the striking U-shaped valleys of Yosemite are the classic product of valley glacier activity, where the glacier’s powerful erosive action sculpts the valley floor and sides. The other options describe glacial or related phenomena that do not produce the same distinctive U-shaped profile typical of a valley glacier.

[REQUIRED] What type of glacier carves U-shaped features, like those seen at Yosemite National Park?Single choice

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