The earth, the Southern Ocean, Southern Ocean collide with the earth. The earth will duck down under the sheets, one sheet. Submerged end of the plate to melt and become magma erupted onto the earth the Southern Ocean.Such as the Marianas Islands, Japan, Philippines Ma Aleutians island. It is a deep ocean trench. Earthquakes along the lines of the earth deep into the mantle. Including a volcano that has power.