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प्रश्न
Are physical and chemical weathering processes independent of each other? If not, why? Explain with examples.
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.
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?
Give geographical reason:
Human activities affect weathering.
List any three factors that affect weathering.
Which is the most important effect of weathering?
What is gradation? Describe the two processes involved in gradation.
Make a chart for your classroom showing the causes of different types of weathering.
How are erosional plains formed?
Distinguish between each of the following: Structural plain and Depositional plains.
What is known as exfoliation? Name the processes involved in it?
What is known as Sheet Wash?
Give a technical term for the following:
Expansion of minerals in rocks on coming into contact with rainwater.
Say whether the following is ‘True’ or ‘False’.
In dry climates mechanical weathering is dominant.
Define weathering and describe the chief characteristics of weathering.
On what factors does the weathering depend?
What is humus? How is it formed? What is its significance in soil formation?
What are different types of soil according to their texture?
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.
Rewrite the following sentence, choosing the right word from the options given below:
_______soils are those which are undisturbed by erosion or deposition.
What do you understand by the following term:
Weathering
What do you understand by the following term:
Soil texture
Give a geographical reason:
Human is an agent of weathering.
Give a geographical reason:
Slope is a major factor in mass wasting.
Which one of the following materials is affected by hydration process?
