Mexico:  Scientists have recorded volcanic activity activity since Tuesday from the Popocatepetl volcano and raised the alert level from "yellow-phase 2" to "yellow-phase 3" on Thursday.  The next alert level is "red alert" and if the alert level is raised, evacuations will begin.  Schools have been closed in the area, as it exhaled steam, gas and ash 41 times as of Thursday, according to the National Center for Disaster Prevention, and it is generating low amplitude tremors.  On Tuesday even...

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