Abstract: The present directional and equidistant distribution of the mid-oceanic ridges on foe earth's surface,the sinusoidal oppositely compensating top and bottom surfaces of the asthenosphere across the ridges,the long development of synchronous tholeiitic rocks symmetrically arranged on either side of the ridge with respect to the crest,as well as the constancy of their positions relative to the oceanic lithosphere,all these have a close relation with earth's rotation and are determined by the dynamic system within the solid earth.
It is considered that the earth is driven by two major force systems-the westward directed force due to earth's rotation and gravity. Under the action of these forces for a considerably long duration of time the different layers of the earth exhibit rheological behaviors to different extents. Using Navier-Stokes equation,we have a solution of the redial and lateral velocities,for the lithosphere and asthenosphere,which may give a satisfactory explanation to the above features.