Scroll to the picture. The quality is not very good but you can see the North American Plate (Okla is on this plate) and it also shows the adjacent plates.
http://boingboing.net/2010/10/14/earthquakes-in-oklah.html
If I live in Oklahoma, what tectonic plate do I live in? How many adjacent plates are there to the one I live on? In which direction are these plates moving?
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