Class-book of GeologyMacmillan and Company, 1886 - 516 páginas |
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Página 131
... molten stream underneath creeps forward ( p . 193 ) . In general , the upper part of a lava - stream is more cellular than the central portions , no doubt because the imprisoned steam can there more easily expand . The bottom , too , is ...
... molten stream underneath creeps forward ( p . 193 ) . In general , the upper part of a lava - stream is more cellular than the central portions , no doubt because the imprisoned steam can there more easily expand . The bottom , too , is ...
Página 139
... an active volcano is a hideous yawning chasm , with rough red and black walls , at the bottom of which lie steaming pools of molten lava . Every now and then , a sharp explosion tears the lava open , Ix . ] 139 VOLCANOES AND FISSURES .
... an active volcano is a hideous yawning chasm , with rough red and black walls , at the bottom of which lie steaming pools of molten lava . Every now and then , a sharp explosion tears the lava open , Ix . ] 139 VOLCANOES AND FISSURES .
Página 141
... molten lava are poured forth . In some instances , the chimney may be finally choked with volcanic blocks , scoriæ , cinders , and ashes , in others with consolidated lava . Examples of both kinds of infilling are found , and also ...
... molten lava are poured forth . In some instances , the chimney may be finally choked with volcanic blocks , scoriæ , cinders , and ashes , in others with consolidated lava . Examples of both kinds of infilling are found , and also ...
Página 146
... molten rock , instead of issuing from one main central Etna or Vesuvius , appears to have risen in thousands of fissures opened in the shattered crust , and to have welled forth from numerous vents on these fissures , spreading out ...
... molten rock , instead of issuing from one main central Etna or Vesuvius , appears to have risen in thousands of fissures opened in the shattered crust , and to have welled forth from numerous vents on these fissures , spreading out ...
Página 151
... molten condition . A succession of lava beds , piled one above another , marks a series of volcanic eruptions , and the nature of the layers of non - vol- canic material intercalated between them may indicate the conditions under which ...
... molten condition . A succession of lava beds , piled one above another , marks a series of volcanic eruptions , and the nature of the layers of non - vol- canic material intercalated between them may indicate the conditions under which ...
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Términos y frases comunes
abundant accumulated acid augite basin beds bones bottom Brachiopods calcareous calcite carbonate of lime Carboniferous chapter characteristic chiefly clay containing corals Cretaceous crinoids crystalline crystals cycads decay deposits detritus Devonian earth earth's crust Eocene Europe evidence example extinct fauna feet thick fishes fissures fossils genera geological history geologist glacier globe gradually granite gravel ground gypsum iron Jurassic kinds known lakes land lava layers limestone living lower marine marls masses materials Mesozoic miles mineral matter Miocene molten mountains natural North occur Old Red Sandstone organic remains original Palæozoic period Permian plants and animals Pliocene present preserved probably quartz rain records regions rivers salt sand schists sea-floor Section sediment sedimentary rocks shales sheets shells siliceous Silurian slopes soil solid sometimes species stone strata stratified stream structure substance surface terrestrial Tertiary tion trace Triassic upper valley various vegetation vent volcanic