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active volcanos appear aqueous ashes augite Auvergne basaltic beds beneath Cantal cavity central clinkstone coast column columnar composed conglomerates considerable consolidation continued cooling crater crust crystalline crystals Darwin depth described distance district dykes earthquakes ejected elevated erup eruptive vent escape Etna explosions felspar felspathic fissures flowed fluid force formation formed fragmentary matter fragments Geol granite greystone heat height hills horizontal hornblende Humboldt Iceland interior internal intumescent island Isles lake lava lava-current lava-rocks lava-streams less leucitic Lipari liquid lava mass Mezen miles mineral character Mont Dore numerous observed occasion occasionally occur olivin orifice outer overlying parallel paroxysmal eruption peperino perhaps phenomena plutonic Ponza porphyry portion pressure probably produced pumice rise rocks scoriae scoriform side slopes Solfatara solid strata Stromboli structure subaerial subterranean summit superficial surface temperature texture tion trachyte tuff upper vapour vast Vesuvius violent vitreous volcanic action volcanic cone volcanic eruptions volcanic mountain volcanic vent
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