What combination of factors was responsible for the disaster west of Yellowstone National Park on August 17, 1959?
A) Rock falls filled a lake with debris until the water overtopped the dam and eroded through the concrete.
B) Water migrating along foliation layers in the metamorphic rock destabilized a dam, which collapsed and flooded the valley.
C) A severe earthquake triggered a slide that blocked a river and flooded a campground.
D) Drainage from the reservoir generated a lahar, which destroyed small towns downstream.
Answer: C
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