The concept of continental drift, continents drifting over the ocean floors, was proposed by Alfred Wegner in 1915. This concept was replaced by the theory of plate tectonics in the 1960s. Changes from the continental drift concept to the plate tectonics theory required which of the following?
strong earthquakes occurring along fault zones
data and ideas being shared among scientists
a scientific law being passed by Congress
teachers beginning to teach the newer theory
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