FILE - In this July 23, 2013 file photo, smoke rises from the crater of the Popocatepetl volcano as seen from a Mexican Navy aircraft on a volcano monitoring mission in Mexico. The Popocatepetl, or ... more 
FILE - In this July 23, 2013 file photo, smoke rises from the crater of the Popocatepetl volcano as seen from a Mexican Navy aircraft on a volcano monitoring mission in Mexico. The Popocatepetl, or “Smoking Mountain” in the Nahuatl language, is a stratovolcano, a steep conical formation built from layers of thick, slow-moving lava and ash. (AP Photo/Dario Lopez-Mills, File) less 
1 / 29
Associated Press | Photo By Dario Lopez-Mills, File
Wed, Jul 31, 2013 6:57 AM EDT