UPSC Exam > UPSC Questions > Consider the following statements. 1. Landsl...
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Consider the following statements.
1. Landslides are caused by only the lubricating action of rainwater
2. Slumping is particularly common where permeable debris or rock layers overlie impermeable strata such as clay
Which of these statements is/are correct?
- a)1 only
- b)2 only
- c)Both of them
- d)Neither of them
Correct answer is option 'B'. Can you explain this answer?
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Most Upvoted Answer
Consider the following statements. 1. Landslides are caused by only t...
Explanation:
Slumping:
- Slumping is a type of landslide that occurs when a mass of rock or soil rapidly moves downhill along a curved surface.
- It is particularly common where permeable debris or rock layers overlie impermeable strata such as clay.
- The presence of impermeable clay restricts the downward movement of water, causing it to accumulate and saturate the overlying material.
- This saturation reduces the friction between the layers, making it easier for the overlying material to slide downhill.
Lubricating Action of Rainwater:
- Landslides can be triggered by various factors, not just the lubricating action of rainwater.
- While rainwater can indeed act as a lubricant, reducing the friction between soil particles and facilitating movement, it is not the sole cause of landslides.
- Other factors such as steep slopes, weak or weathered rock, earthquakes, volcanic activity, and human activities like deforestation and construction can also contribute to landslides.
Therefore, statement 2 is correct as slumping is indeed more common where permeable debris overlies impermeable strata like clay. Statement 1, on the other hand, oversimplifies the causes of landslides by focusing solely on the lubricating action of rainwater.
Slumping:
- Slumping is a type of landslide that occurs when a mass of rock or soil rapidly moves downhill along a curved surface.
- It is particularly common where permeable debris or rock layers overlie impermeable strata such as clay.
- The presence of impermeable clay restricts the downward movement of water, causing it to accumulate and saturate the overlying material.
- This saturation reduces the friction between the layers, making it easier for the overlying material to slide downhill.
Lubricating Action of Rainwater:
- Landslides can be triggered by various factors, not just the lubricating action of rainwater.
- While rainwater can indeed act as a lubricant, reducing the friction between soil particles and facilitating movement, it is not the sole cause of landslides.
- Other factors such as steep slopes, weak or weathered rock, earthquakes, volcanic activity, and human activities like deforestation and construction can also contribute to landslides.
Therefore, statement 2 is correct as slumping is indeed more common where permeable debris overlies impermeable strata like clay. Statement 1, on the other hand, oversimplifies the causes of landslides by focusing solely on the lubricating action of rainwater.
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Consider the following statements. 1. Landslides are caused by only t...
- Landslides may be caused because a river or the sea undercuts a steep slope to fall by gravity.
- Earthquakes or volcanic disturbances may loosen rocks and start a landslide.
- Human-made steepening both undercuts the slope and sets up vibrations which may loosen rocks or soil.
- But often landslides are caused by the lubricating action of rainwater. Water may collect in joints or bedding planes in rocks so that one layer slides over another, especially in areas of tilted strata.
- Slumping is particularly common where permeable debris or rock layers overlie impermeable strata such as clay. The clay halts water sinking through the permeable material.
- The damp clay provides a smooth, slippery surface over which the upper layers easily slide.
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Consider the following statements. 1. Landslides are caused by only the lubricating action of rainwater 2. Slumping is particularly common where permeable debris or rock layers overlie impermeable strata such as clay Which of these statements is/are correct?a) 1 onlyb) 2 onlyc) Both of themd) Neither of themCorrect answer is option 'B'. Can you explain this answer?
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Consider the following statements. 1. Landslides are caused by only the lubricating action of rainwater 2. Slumping is particularly common where permeable debris or rock layers overlie impermeable strata such as clay Which of these statements is/are correct?a) 1 onlyb) 2 onlyc) Both of themd) Neither of themCorrect answer is option 'B'. Can you explain this answer? for UPSC 2024 is part of UPSC preparation. The Question and answers have been prepared according to the UPSC exam syllabus. Information about Consider the following statements. 1. Landslides are caused by only the lubricating action of rainwater 2. Slumping is particularly common where permeable debris or rock layers overlie impermeable strata such as clay Which of these statements is/are correct?a) 1 onlyb) 2 onlyc) Both of themd) Neither of themCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for UPSC 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Consider the following statements. 1. Landslides are caused by only the lubricating action of rainwater 2. Slumping is particularly common where permeable debris or rock layers overlie impermeable strata such as clay Which of these statements is/are correct?a) 1 onlyb) 2 onlyc) Both of themd) Neither of themCorrect answer is option 'B'. Can you explain this answer?.
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