In 1959, the water stored behind Hegben Lake Dam in Montana began to slosh violently back and forth in a series of oscillating waves. These seiches were caused by ________.
A. a freight train plunging off a track and into the lake
B. the collapse of the dam
C. a large landslide into the lake
D. a small meteor crashing into the lake
E. a sudden drop of the lake bottom during an earthquake
Answer: E
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