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Question
Is weathering essential as a pre-requisite in the formation of soils? Why?
Solution
Yes, weathering is an essential pre-requisite in the formation of soils. Weathering is action of elements of weather and climate over earth materials. There are a number of processes within weathering which act either individually or together to affect the earth materials in order to reduce them to fragmental state. Weathering is mechanical disintegration and chemical decomposition of rocks through the actions of various elements of weather and climate.
Weathering is an important process in the formation of soils. When rocks undergo weathering, rocks start to break up and take form of soil gradually.
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Can you suggest some ways by which we can reduce soil degradation?
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.
List any three factors that affect weathering.
In which regions of the world is ‘frost action’ the common form 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.
What are exogenic forces?
Give one example of rapid mass movement.
Describe the chief characteristics of weathering in different climates.
On what factors does the weathering depend?
What do you understand by the following term:|
Carbonation
What do you understand by the following term:|
Desilication
What are different types of soil according to their texture?
What do you understand by the following term:
Soil profile
Account for the two types of weathering.
How does frost action cause weathering?
Give reasons for the following :
A soil dominated by clay makes tilling difficult.
Explain the following terms.
Bases
Give a geographical reason:
Temperature is the main factor behind granular weathering.
Give a geographical reason:
Slope is a major factor in mass wasting.
Give a geographical reason:
Oxidation changes the size and colour of the rocks.
A region is having an annual mean temperature of 5°C and an annual rainfall of 1000 mm. Can you comment upon the weathering and the type with the help of the following questions? Discuss in class.
- Which type of weathering will be dominant here?
- Where will such a region be found?
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.
Name three types of weathering.
