Soil Class 7 Science Notes - Chapter 9

Soil plays an important role in the existence of life on earth. Soil profile can be defined as a section through various layers of soil. These various layers are known as horizons. The percolation rate of water differs from soil to soil. Different crops are cultivated in different types of soil. The different types of soils are –

  • Clayey Soil – The percolation rate of water is least in clayey soil. This soil is used to make statues and pots. Crops that can be grown in such type of soil are gram, paddy, etc.
  • Sandy Soil – They are free draining, with a fine as well as hard particles and gritty feel. It does not bind very well. The nutrient value is low. Also, the percolation rate of water is highest in sandy soil. Example, cotton can be grown in sandy loam soil.
  • Loamy Soil – It is a mixture of clay, sand, and silt. Silt is found in river beds. The size of these particles is between those of clay and sand. The percolation rate of water is moderate. Crops that can be grown in such type of soil are wheat, paddy, etc.

Some factors that affect soil are rainfall, wind, temperature, humidity, and light.

Soil Class 7 Extra Questions

  1. Explain the process of soil formation.
  2. Distinguish between sandy soil and clayey soil.
  3. Write the measures that need to be taken to prevent soil pollution.
  4. Can you draw the cross section of soil and label different layers?
  5. Explain how soil erosion can be prevented?

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Which of the following is a part of inorganic impurity in sewage?