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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
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 |
Which is the most important effect of weathering?
Distinguish between the Structural plain and Depositional plains.
What is weathering?
What is the chief characteristic of weathering in tropical climates?
Name any two slow movements of mass wasting.
Give a technical term for the following:
Disintegration or decomposition of rock.
Distinguish between :
Loess and Alluvium.
What do you understand by the following term:|
Exfoliation
What do you understand by the following term:|
Oxidation
What do you understand by the following term:|
Carbonation
What do you understand by the following term:|
Desilication
What do you understand by the following term:|
Humus
How are the different kinds of soils in Temperate zones formed?
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.
Rewrite the following sentence, choosing the right word from the options given below:
_______soils are those which are undisturbed by erosion or deposition.
Define the following term briefly:
Soil texture
What do you understand by the following term:
Soil texture
Describe the work of plants as agents of weathering.
Give reasons for the following :
Farmers are encouraged to adopt soil conservation methods.
Explain the following terms.
Bases
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.
On the basis of the given points, differentiate between weathering and erosion.
| Weathering | Erosion | |
| Definition | ||
| Causes/Agents | ||
| Effect/Results | ||
| Examples |
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.
It is weathering that is responsible for bio-diversity on the earth. How?
