Discussion
Which of the following statements accurately describes a debris flow ?
Answer: C
A debris flow is a rapid, fluid-like movement of a mixture of water, rock, soil and organic debris.
Debris flows usually follow heavy rain on steep slopes. Water saturates loose material until it behaves like a thick liquid and surges down channels at high speed, carrying boulders, mud and trees.
The other options describe different kinds of mass movement. Slow, gradual movement of soil is creep. The free fall of rock is a rockfall. Movement of dry, unconsolidated material, such as a dry granular avalanche, lacks the water that makes a debris flow fluid.
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