Class-book of GeologyMacmillan and Company, 1890 - 516 σελίδες |
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Σελίδα 2
... less frequent but more powerful influences come into play . In most large regions of the globe , the ground is often convulsed by earth- quakes , many of which leave permanent scars upon the surface of the land . Volcanoes , too , in ...
... less frequent but more powerful influences come into play . In most large regions of the globe , the ground is often convulsed by earth- quakes , many of which leave permanent scars upon the surface of the land . Volcanoes , too , in ...
Σελίδα 5
... less completely the record of these changes . In the following pages , I propose to follow this method of inquiry , and , as far as the subject will permit , to start with no assumptions which the learner cannot easily verify for ...
... less completely the record of these changes . In the following pages , I propose to follow this method of inquiry , and , as far as the subject will permit , to start with no assumptions which the learner cannot easily verify for ...
Σελίδα 13
... less striking manner . ( 2 ) Saturation and Desiccation . — Another cause of the decay of the exposed surfaces of rocks is to be sought in the alter- nate soaking of them with rain and drying of them in sunshine , whereby the component ...
... less striking manner . ( 2 ) Saturation and Desiccation . — Another cause of the decay of the exposed surfaces of rocks is to be sought in the alter- nate soaking of them with rain and drying of them in sunshine , whereby the component ...
Σελίδα 18
... less than 10 tons per annum over an acre of ground . Only the finest particles of mould are swallowed by worms and conveyed by them to the surface , and it is precisely these which are most apt to be washed off by rain or to be dried ...
... less than 10 tons per annum over an acre of ground . Only the finest particles of mould are swallowed by worms and conveyed by them to the surface , and it is precisely these which are most apt to be washed off by rain or to be dried ...
Σελίδα 19
... less covered with vegetation , which in some measure arrests the descent of the debris . But from time to time , during heavy rains , deep gullies are torn out of them by rapidly formed torrents , which sweep down their materials to ...
... less covered with vegetation , which in some measure arrests the descent of the debris . But from time to time , during heavy rains , deep gullies are torn out of them by rapidly formed torrents , which sweep down their materials to ...
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Άλλες εκδόσεις - Προβολή όλων
Συχνά εμφανιζόμενοι όροι και φράσεις
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 mountains natural occur Old Red Sandstone organic remains original Palæozoic Paleozoic 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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