According to Wegener, displacement towards the equator is due to the force of gravity of the sun and the moon. While mathematicians have proven that for the displacement of the land to the equator, the amount of gravitational force needed is 10 billion times more than the current force. Mathematic critics believe that it is impossible to have such a force. However, if was it possible, then due to that much force, the rotation of the earth would have been interrupted.