In North America and Europe, the ice cap reaches 4 km in
thickness and the weight of the ice lowers the Earth’s crust. When at the end of
the glacial period the ice melts, the crust rebounds, producing slopes and
forming large basins, such as the Baltic Sea and the Great Lakes of North
America. Numerous Canadian, Swedish and Finnish lakes originated in this way.
The Earth’s crust rebounds cause unique earthquakes not
associated with tectonic plates. The lifting of the crust occurs in two phases.
The first is elastic and fast and can reach several hundred meters, the second
is slow. Today the typical lifting rates are in the order of 1 cm per year or
less.
The Vital Needs Theory - page 96