Tectonic plates float over the mantle of the Earths core. Hot magma wells up at the ridges of the Earths tectonic plates, creating fissures as it forms new ocean crust and shoves the platesapart. At subduction zones, two tectonic plates meet and one slides beneath the other back into the mantle. The cold, sinking platepulls the crust behind it downward. The earthquakes, tsunamis and volcanic eruptions that we are experiencing in the world today can all be related to the shifting of the plates.