What’s the primary difference between a flash flood and a debris flow?
select one:
a. flash floods move faster
b. debris flows usually carry boulders
c. debris flows are driven by precipitation
d. flash floods are driven by precipitation
e. debris flows move faster
a, c, and d are wrong answers

E. Debris flows move faster.

Explanation:

As debris flow is a moving mass of sand, soil, silt under the influence of gravity which upon rainfall moves with a lot of force. As the steep slopes, the speed can reach up to 100 miles i.e 160 km/hr. Debris flows are accelerated downhill by gravity and tend to follow steep mountain channels that debouche onto alluvial fans or floodplains.

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explanation: