Glacial Erosion and the Formation of Landforms Flashcards

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What is a corrie, and how is it formed?

A corrie (cirque) is a deep, hollowed-out basin formed at the head of a glacier.

Snow accumulates in a hollow spot, turns into ice, and deepens the hollow through freeze-thaw cycles and abrasion. The glacier moves downhill, creating a semi-circular path and leaving a lake, known as a corrie lake, after the ice melts.

How do glacial troughs and ribbon lakes form?

Glacial troughs form when glaciers reshape V-shaped river valleys into broader U-shaped valleys through erosion.

As glaciers recede, these troughs can fill with water, creating elongated bodies of water known as ribbon lakes.

What are hanging valleys, and how do they form?

Hanging valleys are smaller valleys that hang above the main glacial trough, formed because tributary valleys are carved less deeply by smaller streams or rivers compared to the main glacier.

They often create waterfalls as water rushes down to the main valley.

What processes contribute to the formation of a corrie?

The formation of a corrie involves snow accumulation, freeze-thaw cycles, abrasion, and rotational slip of the glacier.

These processes deepen and steepen the hollow, eventually forming a corrie lake when the ice melts.

Why do glacial troughs have a U-shape?

Glacial troughs have a U-shape because glaciers act like bulldozers, scraping and eroding the valley floor and sides, creating broader and flatter valleys compared to the V-shaped valleys formed by rivers.

What causes the formation of ribbon lakes in glacial troughs?

Ribbon lakes form in glacial troughs when glaciers erode V-shaped valleys into U-shaped valleys.

The glacier’s movement picks up rocks and deposits them as moraines. When the glacier recedes, these troughs fill with water, creating long, narrow ribbon lakes.

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