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Mythology and Early Speculation on Volcanoes
Classification of Volcanoes
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activity appears base began belt boiling caldera cinders cloud column cone consists contained continued covered crater crust cycle deep depth described destroyed developed dome drilling early earth earthquakes ejected entire eruption explosions extending fact Fault feet FIGURE fire fissure floor formed gases geologic Geysers ground heat height hundred increased indicated island issued Italy Jorullo Kilauea kilometers known Lake later lava flows less located magma mass material meters miles Mount mountain natural observed occurred ocean opened origin Pacific Parícutin percent period Pleistocene present pressure produced pumice reached recent record region reported result rising rocks showing side slope springs stage steam stones Stromboli summit surface temperature theory thickness thousand tion vent Vesuvius volcanoes volume zone