Rudiments of GeologyW. and R. Chambers, 1845 - 222 páginas |
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Página 17
... chiefly of three classes : -1 . Those made in mine- ral veins , or in mountain masses , such as granite ; 2. Those made in stratified rocks , as in coal mines ; and , 3. Those made in Artesian wells and other deep - seated springs ...
... chiefly of three classes : -1 . Those made in mine- ral veins , or in mountain masses , such as granite ; 2. Those made in stratified rocks , as in coal mines ; and , 3. Those made in Artesian wells and other deep - seated springs ...
Página 21
... chiefly of muri- ate of soda ( common salt ) , sulphate of soda , muriate of lime , and muriate of magnesia . It has been also ascertained that the southern ocean contains more salt than the northern ; that small inland seas , though ...
... chiefly of muri- ate of soda ( common salt ) , sulphate of soda , muriate of lime , and muriate of magnesia . It has been also ascertained that the southern ocean contains more salt than the northern ; that small inland seas , though ...
Página 30
... chiefly instrumental in modify- ing the crust of the globe , all , more or less , exert a degrad- ing or wasting influence ; that is , a tendency to wear down the surface to a lower level . Wind occasionally presents an exception to ...
... chiefly instrumental in modify- ing the crust of the globe , all , more or less , exert a degrad- ing or wasting influence ; that is , a tendency to wear down the surface to a lower level . Wind occasionally presents an exception to ...
Página 44
... chiefly owing the vegetable deposits in all ages of the world . 82. Trees and plants are annually carried down by rivers , and deposited along with the layers of sand and mud which have already been noticed . The rafts of the ...
... chiefly owing the vegetable deposits in all ages of the world . 82. Trees and plants are annually carried down by rivers , and deposited along with the layers of sand and mud which have already been noticed . The rafts of the ...
Página 47
... chiefly employed in modifying the structure of the globe may be divided into four classes - ATMOSPHERIC , AQUEOUS , IGNEOUS , and ORGANIC . The former two exert a degrading or wasting influence , and if not counterbalanced by other ...
... chiefly employed in modifying the structure of the globe may be divided into four classes - ATMOSPHERIC , AQUEOUS , IGNEOUS , and ORGANIC . The former two exert a degrading or wasting influence , and if not counterbalanced by other ...
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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...