Advertisements
Advertisements
प्रश्न
How does frost action cause weathering?
उत्तर
In the middle latitudes, temperature may be above freezing point of water during day time and below 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 day time 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 the year round.
APPEARS IN
संबंधित प्रश्न
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.
Distinguish between the following pair:
Weathering and erosion
Give geographical reason:
Gases in the atmosphere affect weathering.
What is gradation? Describe the two processes involved in gradation.
Give a technical term for the following:
Expansion of minerals in rocks on coming into contact with rainwater.
Describe the chief characteristics of weathering in different climates.
On what factors does the weathering depend?
What do you understand by the following term:|
Humus
Match the following pairs correctly:
| A | B |
| (a) A soil formed at a place or a particular site | Alluvium |
| (b) Over a long period of time this soil become mature | Transported soil |
| (c) It is most fertile soil when renewed every year | Podzol |
| (d) This soil is found is cool or cold humid areas | Residual |
Give reasons for the following :
Grassland soils are less acidic than forest soils.
