The Student's Handbook of Physical GeologyG. Bell and Sons, 1884 - 514 pages |
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Page 20
... frequently take place from the same vent , but minor cones are often formed on the flanks of the larger one , and lesser eruptions proceed from them . Volcanoes are sometimes isolated mountains like Vesuvius and Etna , but are more ...
... frequently take place from the same vent , but minor cones are often formed on the flanks of the larger one , and lesser eruptions proceed from them . Volcanoes are sometimes isolated mountains like Vesuvius and Etna , but are more ...
Page 22
... frequent occurrence in the history of volcanoes . Vesuvius is known to have presented this appearance at several periods , and is even now partially surrounded by the old crater - ring called Monte Somma ( see fig . 4 ) . Barren Island ...
... frequent occurrence in the history of volcanoes . Vesuvius is known to have presented this appearance at several periods , and is even now partially surrounded by the old crater - ring called Monte Somma ( see fig . 4 ) . Barren Island ...
Page 23
... frequently succeed these noises ; the water in wells and springs sink down in consequence of the opening of rents and fissures below ; and finally , owing to the transmission of submarine shocks , the sea often ebbs and flows in an ...
... frequently succeed these noises ; the water in wells and springs sink down in consequence of the opening of rents and fissures below ; and finally , owing to the transmission of submarine shocks , the sea often ebbs and flows in an ...
Page 24
... frequent , and great floods are thereby occasioned . The rain - water courses down the slopes and sweeps along the loose volcanic dust and ash , forming muddy torrents , which often work more damage and destruction than the streams of ...
... frequent , and great floods are thereby occasioned . The rain - water courses down the slopes and sweeps along the loose volcanic dust and ash , forming muddy torrents , which often work more damage and destruction than the streams of ...
Page 27
... frequently a crystalline stone . The gradual cooling of the lava causes it to contract , and leads to the production of cracks , which traverse the whole mass from top to bottom . These are sometimes so regular as to split the mass up ...
... frequently a crystalline stone . The gradual cooling of the lava causes it to contract , and leads to the production of cracks , which traverse the whole mass from top to bottom . These are sometimes so regular as to split the mass up ...
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Common terms and phrases
accumulated acid action alumina amount angles anticlinal augite basalt beds blocks bottom calcareous called carbonate of lime carbonic acid chalk chemical clay cleavage cliffs coal coast colour consist containing coral cracks crystalline crystals denudation deposits depth described detrition distance district dolerite dykes earth earth's crust elevation erosion excavated fault feet felspar fissures Foraminifera formation formed fragments Geol glacier glauconite gradually granite greensand ground hills horizontal hornblende igneous rocks island joints Jukes lake land lava layers less limestone magnesia mass material matter metamorphic metamorphic rocks mica miles mineral mountain observed occur origin Orthoclase outcrops particles pebbles planes porphyritic portion present pressure produced quartz rain reef river salt sand sandstone shales shells shore side siliceous Silurian slope solid solution sometimes stones strata stratified rocks stream structure sulphate surface synclinal thickness tide tion Trans valley vertical volcanic waves