for scene 11 of the video " Ice Age 2050s: Certainty 1" by Rolf Witzsche
here for a larger image
The ocean levels had dropped 400 feet
During the last glaciation environment water vapor had turned into snow and had accumulated on land so massively over time that the ocean levels had dropped 400 feet.
The vast historically known sea-level reduction amounts to ice accumulations on land on a scale that defies the imagination. The ice has shaped the landscape.
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Published by Cygni Communications Ltd.
North Vancouver, BC, Canada - (C) in public domain - producer Rolf A. F.