qExplanation 2:
Ice Slipping Effect (nothing to do with climate
changes)
q During earlier glaciations (2.75 – 0.9 Myr ago), ice sheets may
have been thin because they slid on water saturated soil toward lower
elevations and warmer temperatures.
q During later glaciations
(beginning from 0.9 Myr
ago), after ice sheets stripped off most of the underlying soil, their central regions could grow higher
because they no longer slid.