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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
Write whether the statement are true or false. Correct the incorrect one.
The breaking down of rocks into smaller particles is called weathering.
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.
People have used various farming methods to increase food production. However, in the process, they have stripped the soil of nutrients, leading to its degradation.
Can you suggest some ways by which we can reduce soil degradation?
In which regions of the world is ‘frost action’ the common form of weathering?
Which is the most important effect of weathering?
How are erosional plains formed?
What are exogenic forces?
Give one example of rapid mass movement.
Say whether the following is ‘True’ or ‘False’.
External forces are engaged only in erosion
What is weathering?
On what factors does the weathering depend?
Distinguish between the following:
Sheet erosion and gully erosion.
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:|
Humus
Define the following term briefly:
Soil texture
What do you understand by the following term:
Weathering
What do you understand by the following term:
Landslide
Account for the two types of weathering.
Describe how changes of temperature lead to weathering.
OR
How do changing temperature lead to weathering?
Give reasons for the following :
Farmers are encouraged to adopt soil conservation methods.
Give reasons for the following :
Grassland soils are less acidic than forest soils.
Explain the following terms.
Colloids
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 |
