With reference to weathering, consider the following statements: 1. It is an ex-situ process where significant motion of materials takes place. 2. It is defined as the mechanical disintegration and chemical decomposition of rocks. 3. It is a pre-requisite for mass movement to occur. Which of the statements given above is/are correct?

The correct option is 2 only Explanation Weathering is the action of elements of weather and climate over earth materials. It acts as a fundamental exogenic geomorphic process responsible for breaking down rocks on the Earth's surface. Statement-wise Analysis - Statement 1 is Incorrect: Weathering is formally defined as the mechanical disintegration and chemical decomposition of rocks through the actions of various elements of weather and climate. - Statement 2 is Correct: Weathering is an in-situ (on-site) process. Very little or no motion of materials takes place during the process. If significant transport or motion of materials occurs, the process is classified as erosion, not weathering. - Statement 3 is Incorrect: While weathering aids mass wasting by loosening rock materials, it is not a pre-requisite for mass movement to occur. Mass movements can be triggered by gravity, seismic activity, or water saturation on unweathered slopes as well. Key Takeaway: Weathering is the static (in-situ) breakdown of rocks, whereas erosion involves the dynamic transport of materials. Mass movement is gravity-driven and does not strictly require prior weathering.

With reference to weathering, consider… - NCERT Class 11 Geography MCQ

NCERT Class 11 Geography — Chapter 4: Geomorphic Processes

mcqmedium

With reference to weathering, consider the following statements:

It is an ex-situ process where significant motion of materials takes place.
It is defined as the mechanical disintegration and chemical decomposition of rocks.
It is a pre-requisite for mass movement to occur.

Which of the statements given above is/are correct?

NCERT textbook question

From NCERT Fundamentals of Physical Geography · Page 42

Options

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

Did you get this right?

Solution

The correct option is

2 only

Explanation

Weathering is the action of elements of weather and climate over earth materials. It acts as a fundamental exogenic geomorphic process responsible for breaking down rocks on the Earth's surface.

Statement-wise Analysis

Statement 1 is Incorrect: Weathering is formally defined as the mechanical disintegration and chemical decomposition of rocks through the actions of various elements of weather and climate.
Statement 2 is Correct: Weathering is an in-situ (on-site) process. Very little or no motion of materials takes place during the process. If significant transport or motion of materials occurs, the process is classified as erosion, not weathering.
Statement 3 is Incorrect: While weathering aids mass wasting by loosening rock materials, it is not a pre-requisite for mass movement to occur. Mass movements can be triggered by gravity, seismic activity, or water saturation on unweathered slopes as well.

Key Takeaway: Weathering is the static (in-situ) breakdown of rocks, whereas erosion involves the dynamic transport of materials. Mass movement is gravity-driven and does not strictly require prior weathering.

Your note

More from Chapter 4: Geomorphic Processes

Which chemical weathering process entails the absorption of water by minerals, leading to expansion?

easy

In geomorphology, the force applied per unit area on earth materials is termed:

easy

With reference to the factor of 'Time' in soil formation, consider the following statements: 1. It determines the maturation of soils and profile development. 2. Soils developing from recently deposited alluvium are considered mature. 3. No specific length of time can be fixed for soils to develop and mature. Which of the statements given above is/are correct?

medium

With reference to topography as a soil-forming factor, consider the following statements: 1. Soils will be thin on steep slopes. 2. Soils will be thin over flat upland areas. 3. Over gentle slopes, soil formation is very favourable due to slow erosion and good percolation. Which of the statements given above is/are correct?

easy

Denudational processes such as erosion and transportation are primarily governed by:

easy

Keep practising Chapter 4: Geomorphic Processes

Work through every question from this NCERT chapter.

Browse all NCERT Class 11 Geography chapters