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Chapter 3: Problem 65

Which of the following describes the formation of a \(U\) shaped valley? A. Erosion caused by slow-moving glaciers cut through the rocks in a river valley. B. Wind and rain erosion weathered rock down smoothly. C. River deposition built up in the center of a valley. D. Sea erosion caused by different wave strengths produced uneven shapes.

Short Answer

Expert verified
A. Erosion caused by slow-moving glaciers cut through the rocks in a river valley.

Step by step solution

01

Understand the Question

The question is asking to identify the process that describes the formation of a U-shaped valley.
02

Analyze Option A

Option A states that erosion caused by slow-moving glaciers cut through the rocks in a river valley. Glaciers are known to carve out U-shaped valleys as they move through the landscape by eroding the sides and bottom of the valley.
03

Analyze Option B

Option B suggests that wind and rain erosion weathered rock down smoothly. This type of erosion typically results in more rounded, not U-shaped, valleys.
04

Analyze Option C

Option C indicates that river deposition built up in the center of a valley. Deposition by rivers usually leads to V-shaped valleys rather than U-shaped ones.
05

Analyze Option D

Option D asserts that sea erosion caused by different wave strengths produced uneven shapes. This type of erosion creates features such as cliffs and wave-cut platforms, not U-shaped valleys.
06

Select the Correct Answer

Through the process of elimination and understanding the specific processes, Option A is the correct description of how U-shaped valleys are formed.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

glacial erosion
Glacial erosion is a powerful geological process. As glaciers slowly move across the landscape, they carve and shape the earth beneath them. This happens through two primary mechanisms: plucking and abrasion.
Plucking occurs when the glacier freezes onto rock below and then moves forward, tearing pieces of rock away. During abrasion, bits of rock and sediment that are frozen into the ice act like sandpaper, scraping and grinding against the ground.
Together, these processes can deeply erode valleys and create the distinctive U-shaped profile through persistent force over thousands of years.
valley types
Valleys come in various shapes and are formed by different processes. The most common types are V-shaped and U-shaped valleys.
V-shaped valleys are typically formed by river erosion. Rivers cut into the ground, creating sharp and narrow valleys with steep sides.
On the other hand, U-shaped valleys are created by glaciers. These valleys have a broad, flat floor and steep, straight walls. The transformation from a V-shaped to a U-shaped valley demonstrates the immense power of glacial erosion, which not only widens the valley but also deepens it. Glacial valleys are part of the dramatic landscapes we see in mountainous regions.
geological processes
Geological processes refer to the natural phenomena that shape Earth's surface. These include both constructive and destructive processes.
Constructive processes, like deposition, build up the earth's surface. For example, sediment carried by rivers is deposited in riverbanks and deltas, creating new landforms.
Destructive processes, like erosion and weathering, wear away the earth's surface. Glacial erosion, as previously mentioned, is a significant destructive process that can carve out massive valleys and alter entire landscapes. Studying these processes helps us understand Earth's dynamic and ever-changing surface.
erosion and deposition
Erosion and deposition are two interconnected geological processes.
Erosion is the process by which soil and rock are removed from the Earth's surface, typically by wind, water, ice, or biological activity. Glacial erosion is a prime example where glaciers wear away the bedrock and deeply carve into the landscape.
Deposition, on the other hand, is the process by which eroded material is transported and deposited in a new location. For example, rivers deposit sediments along their banks or at their mouths, forming deltas. Together, these processes continuously reshape the earth, influencing natural features and impacting ecosystems.

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Most popular questions from this chapter

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