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.

Question

Quizplus · Accepted Answer

The 1959 Hebgen Lake earthquake, measuring 7.5 on the Richter scale, triggered a massive landslide that blocked the Madison River, creating Quake Lake and flooding a campground, which led to the disaster west of Yellowstone National Park.

What Combination of Factors Was Responsible for the Disaster West