The Student's Handbook of Physical GeologyG. Bell, 1892 - 666 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
... 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 trans- mission 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 trans- mission of submarine shocks , the sea often ebbs and flows . in an ...
Page 23
... frequently a discharge of black sand or comminuted pumice . In some cases the eruption does not proceed farther than stage No. 2 ; but in violent eruptions there is a continued repeti- tion of heavy explosions and outflows of lava ...
... frequently a discharge of black sand or comminuted pumice . In some cases the eruption does not proceed farther than stage No. 2 ; but in violent eruptions there is a continued repeti- tion of heavy explosions and outflows of lava ...
Page 24
... 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 . 5 ) . 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 . 5 ) . Barren Island ...
Page 30
... portion is a hard , com- pact , and frequently a crystalline stone . The gradual cooling of the lava causes it to contract , and leads to the production of cracks , which traverse the 30 [ SEC . I. DYNAMICAL GEOLOGY .
... portion is a hard , com- pact , and frequently a crystalline stone . The gradual cooling of the lava causes it to contract , and leads to the production of cracks , which traverse the 30 [ SEC . I. DYNAMICAL GEOLOGY .
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Common terms and phrases
acid action agencies altered alumina amount anticlinal augite basalt beds blocks bottom calcareous calcite called carbonate of lime carbonic acid chalk channel chemical clay cleavage cliffs coast colour consists coral cracks crystalline crystals currents débris denudation deposits depth described detrition distance district dolerite dykes earth earth's crust Edited elevation erosion eruptions fault feet felspar fissures formation formed fragments Geol Geology glacier glauconite gneiss gradually granite greensand ground hills horizontal hornblende igneous rocks iron island Jukes lakes land lava layers limestone magnesia mass material metamorphic mica miles mineral mountain occur original Orthoclase outcrop oxide particles pebbles planes porphyritic portion pressure produced quartz rain reefs ridge rise river sand sandstone schist shale shells shore side siliceous slope soil solution sometimes stones strata stratified rocks stream structure surface thickness tion tract Translated unconformity valley vertical volcanic