When the rail line in the accompanying photo was built in rural Alaska in the 1940s, the terrain was

When the rail line in the accompanying photo was built in
rural Alaska in the 1940s, the terrain was relatively level. Not long after the
railroad was completed, a great deal of subsidence and shifting of the ground
occurred, turning the tracks into the “roller coaster” shown here. As a result,
the rail line had to be abandoned. Suggest a reason why the ground became
unstable and shifted.

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