Advertisements
Advertisements
प्रश्न
Are physical and chemical weathering processes independent of each other? If not, why? Explain with examples.
Advertisements
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.
APPEARS IN
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.
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 |
What is weathering?
What are exogenic forces?
What is known as Sheet Wash?
Give a technical term for the following:
Peeling off of the outer layer of rock through contraction and expansion.
Say whether the following is ‘True’ or ‘False’.
External forces are engaged only in erosion
Describe the chief characteristics of weathering.
What is weathering?
Distinguish between :
Loess and Alluvium.
On what factors does the weathering depend?
Distinguish between the following:
Sheet erosion and gully erosion.
What are different types of soil according to their texture?
Define the following term briefly:
Soil texture
Distinguish between the following :
Erosion and Weathering.
What do you understand by the following term:
Weathering
What do you understand by the following term:
Landslide
What do you understand by the following term:
Soil texture
Account for the two types of weathering.
How does frost action cause 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.
Give reasons for the following :
Grassland soils are less acidic than forest soils.
Explain the following terms.
Bases
Give a geographical reason:
Temperature is the main factor behind granular weathering.
On the basis of the given points, differentiate between weathering and erosion.
| Weathering | Erosion | |
| Definition | ||
| Causes/Agents | ||
| Effect/Results | ||
| Examples |
Name three types of weathering.
