Which type of landslide is characterized by the backward rotational movement of the displaced material?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. Rotational slump.
Rotational Slump is the sliding mass moves along a concave, curved failure surface (like a spoon). This rotational movement causes the head (top) of the slide mass to drop down and tilt backward toward the slope.
Other Options:
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Rock Fall: Involves the free-falling movement of masses of rock from a steep cliff or slope, often due to gravity and weathering. There is no rotational or translational sliding.
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Debris Flow: A fast-moving, fluidized mixture of loose soil, rock fragments, and a significant amount of water. The movement is like a viscous liquid, not a solid, rotating block.
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Translational Slide: The slide mass moves along a relatively flat or planar failure surface parallel to the slope. The movement is largely straight down or out, without significant rotation.