What was a key cause of failure in the St Francis...

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What was a key cause of failure in the St. Francis Dam (1928)?

A. Construction in sedimentary basin

B. Water overtopping

C. Geological instability due to schist

D. Fault slip

Answer: Option C

Solution (By Examveda Team)

The failure occurred due to geological instability in schist and faulted rock. Water seepage weakened the foundation, and the dam collapsed catastrophically.

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