The hypothesis of continental drift states that earth's continents, which are located on tectonic plates, move relative to each other. which of the following is true of the movement of the tectonic plates? a. they move at a rate of approximately 5 centimeters per year. b. their movements are very rapid and occur at random times. c. tectonic plates only move once every million years. d. tectonic plates never move, only the continents located on them do.