Cities beneath the sea
Heat from the Earth’s deep interior helps keep much of North America afloat by warming the continental crust and making it buoyant, scientists say. If not for this effect, many American coastal cities would lie beneath the sea.
The findings show that if North America had a uniform crust, many American cities would be underwater. New York City, for example, would be dunked 1,427 feet beneath the Atlantic. Boston would be 1,823 below sea level, and Los Angeles would be 3,756 beneath the Pacific.
http://www.livescience.com/environment/070625_bouyant_namerica.html
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