Class-book of GeologyMacmillan, 1896 - 404 páginas |
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Resultados 6-10 de 74
Página 27
... lower . Partly , therefore , owing to the fine dust and soil swept into them by wind and rain from the slowly decomposing surface of the land , and partly to the friction of the detritus which they sweep along their channels , rivers ...
... lower . Partly , therefore , owing to the fine dust and soil swept into them by wind and rain from the slowly decomposing surface of the land , and partly to the friction of the detritus which they sweep along their channels , rivers ...
Página 29
... lower end as a clear trans- parent river . The Rhone , for instance , flows into the Lake of Geneva as a turbid stream ; it issues from that great reservoir at Geneva as a rushing current of the bluest , most translucent water which ...
... lower end as a clear trans- parent river . The Rhone , for instance , flows into the Lake of Geneva as a turbid stream ; it issues from that great reservoir at Geneva as a rushing current of the bluest , most translucent water which ...
Página 32
... lower rock , large portions of the face of the precipice behind the Falls are from time to time precipitated into the boiling flood below . The waterfall is thus slowly prolonging the ravine below the Falls . The magnificent gorge in ...
... lower rock , large portions of the face of the precipice behind the Falls are from time to time precipitated into the boiling flood below . The waterfall is thus slowly prolonging the ravine below the Falls . The magnificent gorge in ...
Página 38
... lower gravel ( a ) point to the existence and direction of the currents by which sediment was pushed forward along that bottom . ( Compare pp . 174 , 175. ) As the river flows onward through a gradually expanding valley , another ...
... lower gravel ( a ) point to the existence and direction of the currents by which sediment was pushed forward along that bottom . ( Compare pp . 174 , 175. ) As the river flows onward through a gradually expanding valley , another ...
Página 39
... lower level . In this manner , it slowly lowers its bed , and leaves on either side a set of alluvial terraces to mark successive stages in the process of excavation . If during this process the level of the land should be raised , the ...
... lower level . In this manner , it slowly lowers its bed , and leaves on either side a set of alluvial terraces to mark successive stages in the process of excavation . If during this process the level of the land should be raised , the ...
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Términos y frases comunes
abundant abundantly accumulated acid Ammonites basin beds bones bottom Brachiopods calcareous calcite Cambrian carbonate of lime Carboniferous Chapter characteristic chiefly clay containing corals Cretaceous crinoids crystalline crystals decay deposits detritus Devonian earth earth's crust Eocene eruptive rocks Europe evidence example extinct fauna feet thick fishes fissures formations fossils genera geological history geologist glacier globe gneiss gradually granite gravel ground iron Jurassic kinds known lakes land lava layers limestone living lower marine marls mass materials Mesozoic miles Miocene molten mountains natural North occur Old Red Sandstone organic remains original Palæozoic period Permian plants and animals Pliocene present preserved probably quartz rain regions represented rivers sand schists sea-floor sediment sedimentary rocks shales sheets shells siliceous Silurian slopes soil solid sometimes species stone strata stratified stream structure substance surface terrestrial Tertiary trace Triassic Trilobites upper valley various vegetation vent volcanic