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प्रश्न
How does frost action cause weathering?
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उत्तर
In the middle latitudes, temperature may be above the freezing point of water during the daytime and below the freezing point during the night. Water present in the joints and fissures in the rocks gets frozen into ice during the night. Freezing of water results in an expansion in volume and the fissures widened.
It is followed by melting during the daytime repeatedly. It is called block disintegration because the rock is split into rectangular blocks along the joints. Frost action is most common in tropical regions and in high mountains all year round.
संबंधित प्रश्न
Complete the flowchart below.
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 known as mass wasting?
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.
Rewrite the following sentence, choosing the right word from the options given below:
_______soils are those which are undisturbed by erosion or deposition.
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?
It is weathering that is responsible for bio-diversity on the earth. How?
Is weathering essential as a pre-requisite in the formation of soils? Why?
