What Sank the Continents in the Atlantic and Pacific Oceans?

I believe that in the sinking of Atlantis in the Atlantic Ocean crucial role played the melting of the huge ice caps of the Big Ice Age 9,500 years ago, which was shifting the weight from the poles to the oceans. In the same way, in the sinking of Lemuria in the Pacific Ocean crucial role played the melting of the huge ice caps of the previous Big Ice Age approximately 36,000 years ago. In these periods of ice melting and instability, it is quite likely that the human negativity played the role of the small stone that overturn the cart.