[GalenErso]

Continents can rise and fall without changes in the quantity of liquid water on the surface. One must also consider the fact that the world was much warmer then, so things like Greenland, the Antarctic ice sheet, and glaciers did not exist. If all the ice covering Antarctica , Greenland, and in mountain glaciers around the world of today were to melt, sea level would rise about 70 meters (230 feet). The answer to your question is that a portion of this water turned into ice. Ice that is now turning back to liquid form thanks to climate change. Another factor is that water is also slowly disappearing into the Earth's crust. When the Russians dug 12 kilometers into the crust, they discovered that rocks at that depth were saturated with water: https://en.wikipedia.org/wiki/Kola_Superdeep_Borehole?useski...