Review the key concepts, formulae, and examples before starting your quiz.
🔑Concepts
Soil is the uppermost layer of the Earth's crust, essential for plant growth and life. It takes approximately to years to form just inch of topsoil.
Soil Erosion: The process of carrying away or washing away of the fertile topsoil by natural agents like wind and running .
Agents of Erosion: Running water (washes away soil in floods), Wind (blows away loose soil in deserts), and Human Activities like deforestation and overgrazing.
Soil Conservation: The protection of soil against erosion to maintain its fertility. It involves methods that reduce the speed of wind and .
Afforestation: Planting trees on a large scale. Roots of trees act as binders that hold soil particles together.
Terrace Farming: Also known as step farming, it is practiced on hilly slopes by cutting steps to reduce the flow of .
Shelterbelts: Planting rows of trees or shrubs along the edges of farmlands to reduce the speed of the wind.
Embankments: Building or along river banks to prevent the river from overflowing and washing away soil.
📐Formulae
💡Examples
Problem 1:
A farmer in a hilly region observes that heavy rainfall washes away the topsoil of his farm, making it difficult for crops to grow. Suggest a conservation method and explain its scientific benefit.
Solution:
The farmer should adopt Terrace Farming.
Explanation:
In hilly areas, flows down the slopes at high speed, carrying soil with it. By cutting 'steps' or terraces, the speed of the is reduced. As the water slows down, the soil eroded from one step is deposited on the next step, preventing total loss of fertile .
Problem 2:
In a dry, flat region with high wind speeds, a farmer finds his blowing away. What should he plant around his field to prevent this?
Solution:
The farmer should plant Shelterbelts.
Explanation:
Shelterbelts are rows of trees planted at short intervals. These trees act as a physical barrier that breaks the force of the wind, thereby preventing the wind from lifting and carrying away the dry, loose particles.