Class-book of GeologyMacmillan and Company, 1890 - 516 páginas |
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Resultados 1-5 de 57
Página 16
... organic matter on which its fertility so much depends . The very decay of the vegetation helps to promote that of the underlying rock , for it supplies various organic acids ready to be absorbed by percolating rain - water , the power ...
... organic matter on which its fertility so much depends . The very decay of the vegetation helps to promote that of the underlying rock , for it supplies various organic acids ready to be absorbed by percolating rain - water , the power ...
Página 24
... organic acids referred to , ready to eat into the surface of the rocks or loose stones which the stream may encounter in its descent . No kind of rock is more liable than limestone to corrosion under such circumstances . Peaty water ...
... organic acids referred to , ready to eat into the surface of the rocks or loose stones which the stream may encounter in its descent . No kind of rock is more liable than limestone to corrosion under such circumstances . Peaty water ...
Página 47
... organic acids or carbonic acid . In this condition , it is liable to be oxidised on exposure . As after oxidation it can no longer be retained in solution , it is precipitated to the bottom where it collects in grains which by ...
... organic acids or carbonic acid . In this condition , it is liable to be oxidised on exposure . As after oxidation it can no longer be retained in solution , it is precipitated to the bottom where it collects in grains which by ...
Página 52
... organic acids and carbonic acid from the soil through which it sinks . By help of these in- gredients , it is enabled to attack even the most durable rocks , and to carry some of their dissolved substance up to the surface of the ground ...
... organic acids and carbonic acid from the soil through which it sinks . By help of these in- gredients , it is enabled to attack even the most durable rocks , and to carry some of their dissolved substance up to the surface of the ground ...
Página 54
... organic matter are readily seized upon to build up the framework and furnish the food of these creatures . But probably more mineral matter is supplied in solution than is re- FIG . 19. - Section of cavern with stalactites and ...
... organic matter are readily seized upon to build up the framework and furnish the food of these creatures . But probably more mineral matter is supplied in solution than is re- FIG . 19. - Section of cavern with stalactites and ...
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Términos y frases comunes
abundant accumulated acid Ammonites ancient Assistant Master beds BOOK bottom Brachiopods calcareous calcite Cambrian Cambridge carbonate of lime Carboniferous Chapter chiefly clay College containing corals Cretaceous crinoids crystalline crystals decay deposits detritus Devonian earth earth's crust Edited ELEMENTARY Eocene eruptive Europe evidence example extinct fauna Fcap feet fissures fossils genera GEOGRAPHY geological history glacier globe gradually granite gravel GREEK ground Illustrated Jurassic kinds known lakes land lava layers limestone living lower marine marls mass materials Mesozoic mineral Miocene molten mountains natural occur Old Red Sandstone organic remains original Palæozoic period Permian plants and animals Pliocene present preserved Prof Professor quartz Red Sandstone regions revised rivers rocks sand schists sediment sedimentary sedimentary rocks shales sheets shells siliceous Silurian soil solid sometimes species stone strata structure substance surface terrestrial Tertiary thick trace Triassic upper various vegetation volcanic
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