A plume of smoke comes out the Tungurahua volcano after it erupted as seen from Cotalo, Ecuador, Wednesday, Nov. 30, 2011. Ecuador's Geophysical Institute said the volcano's increased activity that began Sunday, is billowing columns of ash, sending superheated clouds of gas down the slopes and cascading hot rocks from the summit.

A view of the Tungurahua volcano as it erupts as seen from Cotalo, Ecuador, Wednesday, Nov. 30, 2011. Ecuador's Geophysical Institute said the volcano's increased activity that began Sunday, is billowing columns of ash, sending superheated clouds of gas down the slopes and cascading hot rocks from the summit.