With reference to 'Glacial Troughs', consider the following statements: 1. They are U-shaped valleys with broad floors. 2. They are always devoid of any debris or moraines. 3. They are formed by the deposition of material by wind. Which of the statements given above is/are correct?

The correct option is 1 only Explanation Glacial troughs, commonly referred to as U-shaped valleys, are prominent erosional landforms created by the movement of glaciers. They are typically formed when a glacier moves down a slope, modifying pre-existing V-shaped river valleys through extensive erosion. Statement-wise Analysis: - Statement 1 is Correct: Glacial troughs are characterized by a distinct U-shape, featuring steep, precipitous walls and a broad, flat floor. This morphology results from the glacier eroding both the sides (lateral erosion) and the bottom (vertical erosion) of the valley simultaneously. - Statement 2 is Incorrect: These valleys are not always devoid of debris. Upon the retreat of the glacier, the valley floor is often littered with debris or till. Additionally, depositional features such as moraines may be present within the trough. - Statement 3 is Incorrect: Glacial troughs are formed by glacial erosion (specifically abrasion and plucking), not by wind deposition. Landforms created by wind deposition include dunes and loess, which are geomorphologically distinct from glacial valleys. Key Takeaway: Glacial troughs are U-shaped erosional landforms with broad floors and steep sides, formed by the glacial modification of river valleys, and often contain depositional debris like moraines.

With reference to 'Glacial Troughs',… - NCERT Class 11 Geography MCQ

NCERT Class 11 Geography — Chapter 5: Landforms and Their Evolution

mcqeasy

With reference to 'Glacial Troughs', consider the following statements:

They are U-shaped valleys with broad floors.
They are always devoid of any debris or moraines.
They are formed by the deposition of material by wind.

Which of the statements given above is/are correct?

NCERT textbook question

From NCERT Fundamentals of Physical Geography · Page 55

Options

A2 only
B1 only
C1 and 3 only
D1, 2 and 3

Did you get this right?

Solution

The correct option is

1 only

Explanation

Glacial troughs, commonly referred to as U-shaped valleys, are prominent erosional landforms created by the movement of glaciers. They are typically formed when a glacier moves down a slope, modifying pre-existing V-shaped river valleys through extensive erosion.

Statement-wise Analysis:

Statement 1 is Correct: Glacial troughs are characterized by a distinct U-shape, featuring steep, precipitous walls and a broad, flat floor. This morphology results from the glacier eroding both the sides (lateral erosion) and the bottom (vertical erosion) of the valley simultaneously.
Statement 2 is Incorrect: These valleys are not always devoid of debris. Upon the retreat of the glacier, the valley floor is often littered with debris or till. Additionally, depositional features such as moraines may be present within the trough.
Statement 3 is Incorrect: Glacial troughs are formed by glacial erosion (specifically abrasion and plucking), not by wind deposition. Landforms created by wind deposition include dunes and loess, which are geomorphologically distinct from glacial valleys.

Key Takeaway:
Glacial troughs are U-shaped erosional landforms with broad floors and steep sides, formed by the glacial modification of river valleys, and often contain depositional debris like moraines.

Your note

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