Correct Option
The correct option is 2 and 3 only.
Explanation
Soil is a vital natural resource that forms through the weathering of rocks over long geological periods. Soil erosion involves the removal of the topsoil layer by various agents. The balance between the rate of soil formation and the rate of soil erosion determines the sustainability of land resources.
Statement-wise Analysis
- Statement 1 is Incorrect: Soil formation is an extremely slow process, often taking hundreds to thousands of years to form just a few centimeters of topsoil. In contrast, soil erosion can occur very rapidly due to heavy rainfall, wind, or human activities. Therefore, the rate of erosion often exceeds the rate of formation, especially in degraded areas.
- Statement 2 is Correct: Terracing is an effective soil conservation method used on slopes. By cutting steps or terraces into the hillside, the speed of surface runoff is reduced, and water is allowed to percolate into the ground. This significantly minimizes soil erosion caused by water flowing down steep gradients.
- Statement 3 is Correct: Water and wind are the two most significant natural agents responsible for soil erosion. Water erosion manifests as sheet, rill, and gully erosion, while wind erosion is prevalent in arid and semi-arid regions where loose soil particles are transported by strong winds.
Key Takeaway
Key Takeaway: Soil is considered a non-renewable resource on a human time scale because its formation rate is negligible compared to the potential rate of its erosion by agents like water and wind.