Mountain ranges in our present world are vastly different from those before the flood.

In the first place, they are as much as four times higher in elevation, some being over 28,000 feet above sea level. Such Mountains could never have been covered by a global Flood; however if the earth were completely flat, only 10,000 feet of water would cover it.

Secondly, they are packed with billions of fossils of plants and animals that were rapidly buried to great depths by the swirling waters of the great flood. Mountains before the flood had no fossils, for they were uplifted by God before living things were created (Gen1;9-10, 20-22)

Thirdly, they are covered with snow and ice. Before the flood, the great vapor canopy (Gen 1; 6-8) produced a greenhouse effect, trapping the reflection of solar heat (as on Venus today) and providing a warm climate even in the polar regions. The collapse of this vapor canopy during the early weeks of the flood (Gen 7:11-12) took the form of snow and Ice in the higher latitudes, causing huge glaciers, the sudden freezing of mammoths and other creatures and the locking up of enough water in the form of ice to expose land bridges from Asia to Alaska and Australia.