Perhaps the worst thing to have ever happened to the field of Geology has been the advent of Google Earth. With Google Earth and all of the great photos that have been released since the cold war ended, idiots like me have been able to look down on the earth and pester you good folk to explain the wonderous things we see.
I'd like to start by getting one of you to explain a feature for me.
Using Google Earth, if you set your eye position at about 400 miles altitude, there is a visible arc with Montgomery, Al at the bottom and swinging in a clockwise manner north towards Nashville, TN.
What is it?
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