Class-book of GeologyMacmillan, 1896 - 404 páginas |
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Resultados 6-10 de 61
Página 17
... gradually eats its way into the solid rock below . Influences are at work also , whereby there is an imper- ceptible removal of material from the surface of the soil . Notable among these influences are Rain , Wind , and Earthworms . In ...
... gradually eats its way into the solid rock below . Influences are at work also , whereby there is an imper- ceptible removal of material from the surface of the soil . Notable among these influences are Rain , Wind , and Earthworms . In ...
Página 19
... gradually washes down the upper parts of the soil to lower levels . Hence arise thick accumulations of what is known as rain -. FIG . 4. - Talus - slopes at the foot of a line of cliffs . FIG . 6. Sand - dunes . 11 19 TALUS - SLOPES ...
... gradually washes down the upper parts of the soil to lower levels . Hence arise thick accumulations of what is known as rain -. FIG . 4. - Talus - slopes at the foot of a line of cliffs . FIG . 6. Sand - dunes . 11 19 TALUS - SLOPES ...
Página 20
... gradually been buried under the fine soil drifted over them by the wind and intercepted and protected by the weeds that grew up over the ruins . Even in regions where , as in Britain , there is a large annual rainfall , seasons of ...
... gradually been buried under the fine soil drifted over them by the wind and intercepted and protected by the weeds that grew up over the ruins . Even in regions where , as in Britain , there is a large annual rainfall , seasons of ...
Página 26
... gradually replaced by coarse shingle and then by finer gravel . In the quieter reaches of the water , sheets of sand begin to make their appearance , and at last when the stream reaches the plains , no sediment of coarser grain than ...
... gradually replaced by coarse shingle and then by finer gravel . In the quieter reaches of the water , sheets of sand begin to make their appearance , and at last when the stream reaches the plains , no sediment of coarser grain than ...
Página 28
... gradually diminish , so that the later stages of decay will be enormously protracted . But by taking the rate of opera- tion now ascertained to be in progress in such a river basin as the Mississippi , we obtain a valuable standard of ...
... gradually diminish , so that the later stages of decay will be enormously protracted . But by taking the rate of opera- tion now ascertained to be in progress in such a river basin as the Mississippi , we obtain a valuable standard of ...
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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