Volcanoes: What They are and what They TeachKegan Paul, Trench, 1881 - 381 Seiten |
Häufige Begriffe und Wortgruppen
active volcanoes andesites appear atmosphere augite Auvergne basaltic basic lavas built canic carbonic acid cavities central centre character chemical composed composition condition cooling crater crater-rings crystalline crystals denuding forces deposited depth dykes earth's crust earth's surface enormous Etna evidence exhibit exist explosive action extinct fact feet fluid formation formed fragments gabbros gases geological periods geologists glassy globe gradually granitic height igneous illustrated incandescent interior iron Islands lapilli lava-currents lava-streams line of fissure Lipari liquid mass materials ejected melaphyres metallic meteorites microliths midst 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 solid steam Stromboli structure substances sulphur summit take place thrown tion trachytic tuff-cones tuffs vapour vast Vesuvius violent volcanic action volcanic cones volcanic districts volcanic forces volcanic mountains volcanic outbursts volcanic phenomena volcanic rocks volcanic vents
Beliebte Passagen
Seite 9 - numerous light curling wreaths of vapour were seen ascending from fissures on the sides and bottom of the crater. Suddenly, and without the slightest warning, a sound was heard like that produced when a locomotive blows off its steam at a
Seite 10 - tumbled into the crater with a loud, rattling noise, but some of them fell outside the crater, and a few rolled down the steep slope of the Sciarra into the sea. Some of these falling fragments were found to be still hot and glowing, and in a semi-molten condition, so that they readily received the impression of a coin thrust into them.
Seite 63 - During the year 1878 masses of floating pumice were reported as existing in the vicinity of the Solomon Isles, and covering the surface of the sea to such extent that it took ships three days to force their way through them. Sometimes
Seite 10 - a great volume of watery vapour was at the same time thrown violently into the atmosphere, and with it there were hurled upwards a number of dark fragments, which rose to
Seite xv - to frame a satisfactory theory of volcanic action, and to show the part which volcanoes have played in the past history of our globe, together with their place in its present economy, was made in 1825, by Poulett Scrope, whose great work, ' Considerations on Volcanoes,' may be regarded as the earliest systematic treatise on Vulcanology.
Seite 3 - the outline of this vapour-cloud varying continually according to the hygrométrie state of the atmosphere, and the direction and force of the wind. At the time
Seite 10 - height of 400 or 500 feet above the crater, describing curves in their course, and then falling back upon the mountain. Most of these fragments