Remnants of ice age linger in gravity

Researchers have uncovered a large area of low but increasing gravity over North America – the lingering effect of the last ice age when sheets of ice sometimes three kilometres thick covered nearly all of Canada and the northeastern U.S.

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<p><a href="http://www.physorg.com/news98026780.html">Remnants of ice age linger in gravity</a></p> <p>Researchers have uncovered a large area of low but increasing gravity over North America – the lingering effect of the last ice age when sheets of ice sometimes three kilometres thick covered nearly all of Canada and the northeastern U.S.</p>