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  • ICAR and TNAU E-Course Summarized

    Summarized Notes
  • The major cause of topsoil being lost due to soil erosion is

    Question: The major cause of topsoil being lost due to soil erosion is

    Options:

    Westerly winds
    Thermal inversion
    Deforestation
    Cattle grazing

    🌍 Soil Erosion:
    → It is a process in which the top fertile layer of soil is lost by natural forces. Due to soil erosion, the soil becomes less fertile.
    The major cause of soil erosion is deforestation, and the different causes of soil erosion are given below.

    🌱 Causes of Soil Erosion:
    → 🌬️ Wind: When strong winds blow, the topsoil along with the organic matter is carried away by the wind. This happens more often when the land is not covered with grass or plants.
    → 💧 Water: When it rains in the hilly areas, the soil gets washed away towards the plains. The running water deposits the mineral-rich soil in the riverbed.
    → 🐄 Overgrazing: When cattle are allowed to graze on the same field repeatedly, all the available grass, including the roots, are eaten by them. This makes the topsoil vulnerable to wind and flowing water, leading to soil erosion.
    → 🌳 Deforestation: Humans have taken land from the forest to cultivate in order to feed the ever-increasing population and to build houses, industries, etc. Cutting down of trees on a large scale for these purposes is known as deforestation. The roots of trees hold the soil together, thus preventing the soil from getting uprooted. When large areas of the forest are cleared, the topsoil gets eroded by wind and flowing water.

    📌 Mistake Points:
    → Overgrazing leads to topsoil erosion, but not just cattle grazing alone causes erosion.

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