Discusses on the evolution of the Moho spheroids

The Moho spheroids have recorded the evolution of the shapes from the "inverted pear" during 650 Ma to the "dumbbell" during 250 Ma and finally to the present-day "normal pear". A new explanation about the mantle currentspassive continental drift presented by the authors in this study suggests that from the 650 Ma onwards, the large-scale N-S and W-E-trending movement of the mantle currents took place in the mantle due to the variations in the Earth's rotation orientation and the slowing of the Earth's rotation velocity, and resulted in the variations in the shapes of the Moho spheroids from the "inverted pear" to the "normal pear".