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प्रश्न
Are physical and chemical weathering processes independent of each other? If not, why? Explain with examples.
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उत्तर
No, physical and chemical weathering are not independent of each other. They are different but still interdependent. Physical or mechanical weathering processes depend on some applied forces.
The applied forces could be:
- gravitational forces such as overburden pressure, load and shearing stress;
- expansion forces due to temperature changes, crystal growth or animal activity;
- water pressures controlled by wetting and drying cycles.
Chemical weathering depends on a group of weathering processes viz; solution, carbonation, hydration, oxidation and reduction act on the rocks to decompose, dissolve or reduce them to a fine clastic state through chemical reactions by oxygen, surface and/or soil water and other acids. Water and air (oxygen and carbon dioxide) along with heat must be present to speed up all chemical reactions. Over and above the carbon dioxide present in the air, decomposition of plants and animals increases the quantity of carbon dioxide underground. These chemical reactions on various minerals are very much similar to the chemical reactions in a laboratory.
These forces are interdependent. For example availability of water and heat depends on physical factors while chemical reactions depend on availability of water and heat.
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संबंधित प्रश्न
Complete the flowchart below.
From encyclopedias and the Internet, find out the different types of soil found in India. Discuss the importance of these soils for crops cultivated in our country. You should form groups in class for this activity.
Match the column
| Column A | Column B |
| 1. Granular disintegration | (i) causes feldspar to become a powdery mass |
| 2. Oxidation | (ii) is common in deserts |
| 3. Carbonation | (iii) is the simplest form of chemical weathering |
| 4. Hydration | (iv) mainly affects limestone regions |
| 5. Solution | (v) results in the rusting of iron |
Give geographical reason:
Gases in the atmosphere affect weathering.
Give geographical reason:
Human activities affect weathering.
Make a chart for your classroom showing the causes of different types of weathering.
How are erosional plains formed?
Distinguish between the Structural plain and Depositional plains.
What is known as exfoliation?
What is known as oxidation?
What are exogenic forces?
What is known as Sheet Wash?
Say whether the following is ‘True’ or ‘False’.
Shear plane is the surface on which movement of a landslide takes place as a result of its breaking off.
What do you understand by the following term:|
Oxidation
What do you understand by the following term:|
Carbonation
Rewrite the following sentence, choosing the right word from the options given below:
_______is produced by the decayed organic material, including dead leaves, stems roots, living bacteria, fungi, worms, and other organisms.
Distinguish between the following :
Erosion and Weathering.
What do you understand by the following term:
Landslide
Describe the work of plants as agents of weathering.
Give reasons for the following :
Climate is the most important factor of soil formation.
Give reasons for the following :
A soil dominated by clay makes tilling difficult.
Give a geographical reason:
Temperature is the main factor behind granular weathering.
Give a geographical reason:
Oxidation changes the size and colour of the rocks.
Consider the given statement and choose the right option given below.
- Small streams that join the main river is tributary.
- River Gangas is a tributary.
Which of the above statement is/are the right statement.
Is weathering essential as a pre-requisite in the formation of soils? Why?
Name three types of weathering.
