Class-book of GeologyMacmillan and Company, 1886 - 516 páginas |
Dentro del libro
Página 2
... , too , in many countries pour forth streams of molten rock and showers of dust and cinders that bury the surround- ing districts and greatly alter their appearance . Turning to the pages of human history , we find. OKIA. OL.
... , too , in many countries pour forth streams of molten rock and showers of dust and cinders that bury the surround- ing districts and greatly alter their appearance . Turning to the pages of human history , we find. OKIA. OL.
Página 125
... molten nucleus enclosed within an outer solid shell or crust . The term is now used merely to denote the cool solid external part of the globe , without implying any theory as to the nature of the interior . It is obvious that we are ...
... molten nucleus enclosed within an outer solid shell or crust . The term is now used merely to denote the cool solid external part of the globe , without implying any theory as to the nature of the interior . It is obvious that we are ...
Página 126
... molten or solid has been the subject of prolonged discus- sion . Three opinions have found stout defenders . ( 1 ) The older geologists maintained that the phenomena of volcanoes and earthquakes could not be explained , except on the ...
... molten or solid has been the subject of prolonged discus- sion . Three opinions have found stout defenders . ( 1 ) The older geologists maintained that the phenomena of volcanoes and earthquakes could not be explained , except on the ...
Página 127
... molten lava are discharged , till they gradually pile up the volcanic cone round the vent whence they escape . A volcanic cone , so long as it remains , bears eloquent testimony to the nature of the causes that produced it . Even many ...
... molten lava are discharged , till they gradually pile up the volcanic cone round the vent whence they escape . A volcanic cone , so long as it remains , bears eloquent testimony to the nature of the causes that produced it . Even many ...
Página 130
... molten rock ( Fig . 35 and p . 193 ) . They vary much in weight and in colour . The heavier kinds are more than three times the weight of water ; or , in other words , they have a specific gravity ranging up to 3.3 ; and are commonly ...
... molten rock ( Fig . 35 and p . 193 ) . They vary much in weight and in colour . The heavier kinds are more than three times the weight of water ; or , in other words , they have a specific gravity ranging up to 3.3 ; and are commonly ...
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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