Word: laccolith
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Dates: during 1940-1949
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Source of Wonder. As the ground rose, a railroad track had to be moved and the bed of a nearby stream had to be deepened. The postmaster kept copious records of every move the mountain made. Geologists decided that it was caused by a "laccolith," a mass of molten material that had forced its way toward the surface, raising local rock strata instead of breaking through them...