Rudiments of GeologyW. and R. Chambers, 1845 - 222 páginas |
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Página 5
... Igneous Agencies , 37 Organic Agencies , 43 Recapitulation of Modifying Causes , 47 MINERAL SUBSTANCES COMPOSING THE EARTH'S CRUST , 48 MEANS OF GEOLOGICAL INVESTIGATION , Forms of Stratification , Positions of Unstratified Rocks , 57 ...
... Igneous Agencies , 37 Organic Agencies , 43 Recapitulation of Modifying Causes , 47 MINERAL SUBSTANCES COMPOSING THE EARTH'S CRUST , 48 MEANS OF GEOLOGICAL INVESTIGATION , Forms of Stratification , Positions of Unstratified Rocks , 57 ...
Página 16
... igneous mass ; fifth , that if volcanoes , hot - springs , & c . take place at the ex- pense of this internal heat , the globe must be gradually cool- ing ; but , lastly , that from the bad conducting nature of the rocky crust , this ...
... igneous mass ; fifth , that if volcanoes , hot - springs , & c . take place at the ex- pense of this internal heat , the globe must be gradually cool- ing ; but , lastly , that from the bad conducting nature of the rocky crust , this ...
Página 17
... igneous are sometimes used indiscriminately ; but it is more accurate to make a distinction . Thus , in treating of volcanoes , we speak of igneous agency ; in treating of hot - springs , thermal is the more appropriate term ...
... igneous are sometimes used indiscriminately ; but it is more accurate to make a distinction . Thus , in treating of volcanoes , we speak of igneous agency ; in treating of hot - springs , thermal is the more appropriate term ...
Página 25
... IGNEOUS , and ORGANIC ; and their modes of action may be either mechanical , chemical , electrical , or vital . These : ATMOSPHERIC AGENCIES . 39. ATMOSPHERIC AGENTS act either mechanically or che- mically the action of wind in drifting ...
... IGNEOUS , and ORGANIC ; and their modes of action may be either mechanical , chemical , electrical , or vital . These : ATMOSPHERIC AGENCIES . 39. ATMOSPHERIC AGENTS act either mechanically or che- mically the action of wind in drifting ...
Página 30
... IGNEOUS , AND ORGANIC . - The student should make himself perfectly familiar with the application of these terms . Wind , for example , is a purely atmospheric agent ; springs , rivers , and waves , are aqueous agents ; volcanoes are ...
... IGNEOUS , AND ORGANIC . - The student should make himself perfectly familiar with the application of these terms . Wind , for example , is a purely atmospheric agent ; springs , rivers , and waves , are aqueous agents ; volcanoes are ...
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Rudiments of Geology: For Use in Schools and for Private Instruction ... David Page Sin vista previa disponible - 2018 |
Términos y frases comunes
abundant accumulations agency ammonite ancient appearance argillaceous basalt beds bituminous bones boulders calcareous carbonate carboniferous chalk character chiefly clay clay-slate coal measures coast colour composed composition contain coral crustacea crystalline debris deposits depth derived districts dry land earth elevated England estuaries evidence existing extensive feet felspar fishes fissures formation fossils fragments fresh-water genera geologists geology gigantic globe gneiss granite grauwacke gravel heat hornblende igneous rocks islands lakes layers less lias lignite lime lower magnesian limestone marine marls mass material matter mica mica schist miles mineral mountain limestone nature numerous occupied occur ocean old red sandstone oolite organic remains origin pebbles peculiar period petrifaction plants and animals present produced quartz reefs reptiles rivers sand schist Scotland shales shells shores silt Silurian soil species specimens stone strata stratified structure subterranean surface terraces terrestrial tertiary strata texture thickness tion trees upper valleys vegetable volcanic wealden zoophytes
Pasajes populares
Página 185 - ... invisible. These animals are of a great variety of shapes and sizes, and in such prodigious numbers, that, in a short time, the whole surface of the rock appears to be alive and in motion. The most common...
Página 88 - With regard to the atmosphere, also, we infer, that had it differed materially from its actual condition, it might have so far affected the rays of light that a corresponding difference from the eyes of existing Crustaceans would have been found in the organs on which the impressions of such rays were then received. Regarding light itself, also, we learn, from the resemblance of these most ancient...
Página 185 - ... the tide reaches every day, it is found to be full of worms of different lengths and colours, some being as fine as a thread, and several feet long, of a bright yellow, and sometimes of a blue colour.
Página 192 - Part of the bed of the sea, says Mrs. Graham, remained bare and dry at high water, " with beds of oysters, muscles, and other shells, adhering to the rocks on which they grew, the fish being all dead, and exhaling most offensive effluvia...
Página 185 - The growth of coral appears to cease when the worm is no longer exposed to the washing of the sea. Thus, a reef rises in the form of a cauliflower, till its top has gained the level of the highest tides, above which the worm has no power to advance, and the reef of course no longer extends itself upwards.
Página 243 - Edinburgh," on the Vertical Position and Convolutions of certain Strata, and their relations with Granite, broached that theory of lateral pressure applied by some unknown force outside the area of the foldings themselves, which is still regarded as the best yet originated on...