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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
Soil formation is an important benefit of weathering. How is it important for mankind?
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.
Make a chart for your classroom showing the causes of different types of weathering.
How are erosional plains formed?
What is weathering?
What is known as mass wasting?
Give one example of rapid mass movement.
Give a technical term for the following:
Disintegration or decomposition of rock.
Say whether the following is ‘True’ or ‘False’.
In dry climates mechanical weathering is dominant.
Distinguish between :
Loess and Alluvium.
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 are different types of soil according to their texture?
How are the different kinds of soils in Temperate zones formed?
Rewrite the following sentence, choosing the right word from the options given below:
_______refers to the gradual disintegration and decomposition of rocks which lie exposed to the elements of weather.
What do you understand by the following term:
Weathering
What do you understand by the following term:
Soil profile
What do you understand by the following term:
Soil texture
How does frost action cause weathering?
State the effects of weathering.
Give reasons for the following :
Farmers are encouraged to adopt soil conservation methods.
Give reasons for the following :
A soil dominated by clay makes tilling difficult.
Explain the following terms.
Colloids
Consider the given statement and choose the right option given below.
- The nature and magnitude of weathering differ from place to place and region to region.
- Granular disintegration takes place due to the action of volcanoes.
- Weathering is a prerequisite in the formation of soil.
Which of the above statement is/are the right statement.
Which one of the following materials is affected by hydration process?
It is weathering that is responsible for bio-diversity on the earth. How?
