Why didn't other scientists believe Alfred Wegener about the continental drift?  

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There were two reasons the scientific community rejected Alfred Wegeners theory of continental drift, which attempted to explain how the major land masses of the earth had drifted to their present locations.  First, Alfred Wegener was a German meteorologist by trade, his theoretical presentation was frowned upon by those actually in the geophysical study of science.  The second reason was Wegener had no feasible explanation for the vehicle his theory suggested.  In other words, he had an interesting idea, but he couldn't actually explain how the continents drifted to their present day locations.  That was left to United States naval officer Harry Hess, when he discovered an underwater mountain range on the bottom of the ocean floor when he was taking sound readings.  Up until that time, the ocean floor had been thought to be a flat desert  area underwater, devoid of mountain ranges, or other submerged topographical features.  Hess' discovery eventually led to the theory of ocean floor spreading, which gave Wegeners theory a mechanism to employ.

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