How Volcanoes Work

Image Described in Caption 
 Strombolian activity on Mt. Etna in October 2002 -- Renewed activity began on Mt. Etna in October and continued into November. The eruption shown here took place along a fissure that opened up along the northern flank of the volcano. Several small vents developed along the fissure. Rather than erupting as sustained lava fountains, large lava bubbles exploded periodically from the vents generating powerful Strombolian events. Copyrighted - courtesy of Tom Pfeiffer.