Edited sentence: One theory suggested by flood geology is that a rapid subduction of oceanic tectonic plates (caused by The Flood) effectively depressed the continental plates above, thus current mountain ranges such as the Himalayas and Rockies were at a much lower floodable elevation.Since most high mountain ranges have experienced large amounts of uplift since the Pliocene, a uniformitarianist would have to assume that after millions of years of gradual uplift from tectonic forcing, a sudden uncharacteristic surge of rapid uplift would have had to occurred.The theory also explains that when the rapid subduction stopped, isostatic equilibrium begins to dominate the area, resulting in a rapid uplift of mountains to much higher elevations