Yikes - check out this link....--
http://www.google.com/imgres?imgurl=http://people.uwec.edu/ERICKSKM/yellowstone-volcano.gif&imgrefurl=http://people.uwec.edu/ERICKSKM/hazards.html&h=632&w=725&sz=40&tbnid=SJuAHEU45vtqRM::&tbnh=122&tbnw=140&prev=/images%3Fq%3Dyellowstone%2Bvolcano&usg=__i1I1-E3EVcOShXnN82eTDHKsupk=&sa=X&oi=image_result&resnum=5&ct=image&cd=1
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