Explanation: Force for Drifting:

• Wegener suggested that the movement responsible for the drifting of the continents was caused by pole-fleeing force and tidal force.
• The polar-fleeing force relates to the rotation of the earth. You are aware of the fact that the earth is not a perfect sphere; it has a bulge at the equator.
• This bulge is due to the rotation of the earth. The second force that was suggested by Wegener — the tidal force — is due to the attraction of the moon and the sun that develops tides in oceanic waters.
• Wegener believed that these forces would become effective when applied over many million years.
• However, most of scholars considered these forces to be totally inadequate.

Source: NCERT Class 11