Concerns grow for Mexico's Popocatepetl volcano that has been spewing molten rock up to a mile from its crater.<img src="http://feeds.feedburner.com/~r/DiscoveryNews-Top-Stories/~4/LfQonO3b2cM" height="1" width="1"/>
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Concerns grow for Mexico's Popocatepetl volcano that has been spewing molten rock up to a mile from its crater.<img src="http://feeds.feedburner.com/~r/DiscoveryNews-Top-Stories/~4/LfQonO3b2cM" height="1" width="1"/>