Based on mechnical description of characteristics of a lighter body moving in anaccelerating fluid,investigation is performed of the application of the principles to continental displacement.Evidence suggests that the plates become inclined due to the earth’s rotation;the inclination depends on the "convection″of the mantle for its head down-or upward;the continental drifting equatorward resuIts from the effects of the couple produced by inertial centrifugal force and related additional force for the plate′s southern down-and northern upward inclination,thereby leading to its equatorward movement.