18 julio 2014
The 1500 mile Appalachian mountain chain runs along a nearly straight line from Alabama to Newfoundland — except for a curious bend in Pennsylvania and New York State. Researchers now know what caused that bend — a dense, underground block of rigid, volcanic rock forced the chain to shift eastward as it was forming millions of years ago.
http://feeds.sciencedaily.com/~r/sciencedaily/~3/FHpN6F0GZNI/140718115628.htm
