The Student's Handbook of Physical GeologyG. Bell, 1892 - 666 pages |
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Page 21
... slopes ; the intervening parts , shaded with fine lines and dots , indicate the successive layers of stones and ashes which have been ejected from the central vent , and are disposed in more or less regular layers inclined at various ...
... slopes ; the intervening parts , shaded with fine lines and dots , indicate the successive layers of stones and ashes which have been ejected from the central vent , and are disposed in more or less regular layers inclined at various ...
Page 22
... slopes being seldom steeper than 10 ° , whereas those of ordinary volcanoes often slope at angles of 28 ° and 30 ° . Volcanoes of this type do not possess a true crater , but only a central pit or caldera , and though the lava sometimes ...
... slopes being seldom steeper than 10 ° , whereas those of ordinary volcanoes often slope at angles of 28 ° and 30 ° . Volcanoes of this type do not possess a true crater , but only a central pit or caldera , and though the lava sometimes ...
Page 24
... . When the latter is the case , it is forced up in jets or fountains of red - hot liquid , from which rivers of lava course down the slopes ; these lavas being generally so fluid that they form streams 50 24 [ SEC . I. DYNAMICAL GEOLOGY .
... . When the latter is the case , it is forced up in jets or fountains of red - hot liquid , from which rivers of lava course down the slopes ; these lavas being generally so fluid that they form streams 50 24 [ SEC . I. DYNAMICAL GEOLOGY .
Page 29
... slopes of the cone like a river , and flows far out from the base of the volcano ; but more usually it only preserves its fluidity for a short distance from the point of exit , a rough slaggy crust quickly form- ing over the surface of ...
... slopes of the cone like a river , and flows far out from the base of the volcano ; but more usually it only preserves its fluidity for a short distance from the point of exit , a rough slaggy crust quickly form- ing over the surface of ...
Page 35
... slope of the mountain , while the scoriæ and fragmentary substances projected at the same time into the air were spread pretty evenly over them . " The result of successive eruptions of this kind has been the formation of a regularly ...
... slope of the mountain , while the scoriæ and fragmentary substances projected at the same time into the air were spread pretty evenly over them . " The result of successive eruptions of this kind has been the formation of a regularly ...
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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