Volcanoes: What They are and what They TeachD. Appleton, 1881 - Broj stranica: 381 |
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active volcanoes andesites appear atmosphere augite Auvergne basaltic basic lavas built canic carbonic acid cavities central centre character chemical composed composition condition containing cooling crater crater-rings crystalline crystals denuding forces deposited depth dykes earth's crust earth's surface enormous eruption Etna evidence exhibit exist extinct fact feet fluid formation formed fragments gases geological periods geologists glassy globe gradually granitic height igneous Illustrations incandescent iron Island lapilli lava-currents lava-streams line of fissure Lipari liquid mass materials ejected melaphyres metallic meteorites microliths miles minerals molten Monte Nuovo observation occur ocean origin parasitic cones portions present pressure produced pumice quantities rhyolites rock-masses scoria-cones scoriæ seen sides silica slope solar prominences solid steam Stromboli structure substances sulphur summit take place thrown tion trachytic tuffs vapour vast Vesuvius violent volcanic action volcanic cones volcanic districts volcanic forces volcanic mountains volcanic outbursts volcanic phenomena volcanic rocks volcanic vents