Discussion
Identify the correct sequence of mass movements on the basis of increasing rate of movement :
Answer: C
The correct order of increasing speed is Creep-rotational landslide-debris flow-rock fall.
Creep moves soil at millimetres to centimetres a year and is the slowest mass movement. A rotational landslide (slump) moves a coherent block over minutes to days. A debris flow is a fast-moving slurry that can travel metres per second, and a rock fall, free fall through the air, is the fastest of all.
Option A puts creep after solifluction and debris flow after rock fall; option B ends with earth flow, which is slower than a rock fall; and option D ends with solifluction, which is almost as slow as creep. Each breaks the order somewhere.
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