Morning Star solutions for Total Geography [English] Class 9 ICSE chapter 9 - Weathering [Latest edition]

The process of breaking down of rocks but not their removal:

Which amongst the following is NOT a characteristic of weathering?

Rock disintegration without any change in the chemical constituents of the rock:

The sudden contraction and expansion peels off the outer rock layer:

Which of the following occurs in moist and cold climates?

Weathering due to the action of animals, plants, and human beings is also known as ______.

Expansion of minerals on coming into contact with rainfall:

Which of the following is more rapid in desert climates?

In which of the following decomposition of rocks take place with changes in the chemical constituents of rocks?

The internal forces operating in the interior of the earth are called ______.

Tension and splitting of rocks is known as ______.

In which of the following climates is physical weathering due to frost action more prevalent?

Assertion (A): Weathering is described as the disintegration or decomposition of a rock in size by natural agents at or near the surface of the earth.

Reason (R): A rock undergoes disintegration or decomposition only by being exposed.

Given below are different climate types with the predominant weathering action. Select which one is incorrect.

1. Equatorial Climate – Chemical weathering
2. Tropical Climate – Chemical weathering
3. Dry Climate – Biological weathering
4. Temperate Climate – Mechanical weathering
5. Polar Climate – Mechanical weathering

Melting of ice in polar regions has increased which type of weathering?

What is weathering?

Name three types of weathering.

Give two differences between physical and chemical weathering.

What is known as exfoliation?

Name the processes involved in exfoliation.

Name the four processes involved in chemical weathering.

What is known as oxidation?

What effect does oxidation have on the colour of rocks?

Distinguish between the following:

Block Disintegration and Exfoliation

Distinguish between the following:

Carbonation and Solution.

Define weathering.

Describe the chief characteristics of weathering.

Give two differences between physical and chemical weathering.

Give a geographical reason for the following:

Physical weathering is also called mechanical weathering.

Give a geographical reason for the following:

Physical weathering is more rapid in desert climates.

Give a geographical reason for the following:

Chemical weathering occurs in moist and cold climates.

Draw a well labelled diagram to show the process of physical weathering.

Describe chemical weathering, mentioning the processes involved in it.

What is biological weathering?

State the main agents of biological weathering.

Give a geographical reason for the following:

Biological weathering is also known as organic weathering.

Give a geographical reason for the following:

Vegetation prevents disintegration of rocks.

Give a geographical reason for the following:

Chemical and biological weathering is negligible in polar climates.

Describe the chief characteristics of weathering in different climates.

Weathering is a natural process, but human activities can speed it up. Do you agree with this statement? Give reasons to support your answer.

It is weathering that is responsible for bio-diversity on the earth. Justify this statement, giving examples.

You went to the Rann of Kutch for the Rann Utsav, which is celebrated annually in Gujarat. On your way, which kind of weathering did you notice? What could be its cause/causes?

Collect rock samples. Perform experiments to study physical and chemical weathering. Write down your report.

Observe the process of weathering active in your surroundings. State its chief characteristics. Draw, paint, or take pictures.