Massive tectonic changes must have been associated with Noah's Flood if the Flood and its after effects are correlated with the record of fossils in the earth's sedimentary rocks. The required tectonic changes include the sinking of all the pre-Flood ocean lithosphere into the mantle, the formation and cooling of all the present-day ocean lithosphere, and displacements of the continents by thousands of kilometers. Such large-scale tectonic change cannot be accommodated within the Biblical time scale if the physical laws describing these processes have been time invariant.