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Landslides involve

  • A.Downslope movement of individual rock blocks which is usually not perceptible.
  • B.Rapid perceptible movement of relatively dry mass of earth debris or bed rock.
  • C.Slow to very rapid movement of water saturated rock debris.
  • D.Slow-flowing downslope masses of rock debris saturated with water.

Answer: B

Landslides are the rapid, perceptible downslope movement of a relatively dry mass of earth, debris or bedrock. They happen suddenly, as the mass slides or falls along a slope when its support is lost.

Downslope movement that is usually not perceptible describes creep, and the slow to very rapid movement of water-saturated debris describes mudflows and debris flows. A slow-flowing mass saturated with water is solifluction. So the dry, rapid and visible movement is the landslide.

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