How Volcanoes Work

 Image Described in Caption
Tarawera hydrovolcanic eruption (1886) -- Mt. Tarawera is a volcanic complex of rhylite domes in the Taupo volcanic field of New Zealand's North Island. A great hydrovolcanic eruption in 1886 generated a buried three villages and killed more than 150 people. The eruption generated a 17-kilometer-long fissure, shown here, and ejected 1.3 cubic kilometers of basaltic tephra. The basaltic airfall in the photo is overlying older rhyolitic domes and felsic airfall. Photo by Vic Camp