Advanced Text-book of Geology, Descriptive and IndustrialBlackwood, 1859 - 403 páginas |
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Página 22
... north in London , began in 1662 to diverge to the west- ward , till in 1815 ( a lapse of 155 years ) it pointed 244 ° west of north . Since 1815 it has been gradually returning from the extreme divergence , and we therefore regard it as ...
... north in London , began in 1662 to diverge to the west- ward , till in 1815 ( a lapse of 155 years ) it pointed 244 ° west of north . Since 1815 it has been gradually returning from the extreme divergence , and we therefore regard it as ...
Página 24
... north to south — that is , from pole to pole - the diameter of the earth is 7899.170 miles ; while measured from east to west , through the equator , the diameter is 7925.648 miles . The equatorial diameter thus exceeds the polar by ...
... north to south — that is , from pole to pole - the diameter of the earth is 7899.170 miles ; while measured from east to west , through the equator , the diameter is 7925.648 miles . The equatorial diameter thus exceeds the polar by ...
Página 30
... North Cape ( lat . 71 ° 10 ′ ) , the snow - level is about 2000 feet above the sea ; in Norway it ranges from 4000 to 6000 feet ; on the Alps and Pyrenees from 8000 to 9000 ; while under the tropics the same altitudes are clothed with ...
... North Cape ( lat . 71 ° 10 ′ ) , the snow - level is about 2000 feet above the sea ; in Norway it ranges from 4000 to 6000 feet ; on the Alps and Pyrenees from 8000 to 9000 ; while under the tropics the same altitudes are clothed with ...
Página 33
... North America , can scarcely be compared with those depending on the gigantic surge that rushes to the height of 60 or 70 feet into the cul de sac of the Bay of Fundy . All these , and similar differences connected with tidal action ...
... North America , can scarcely be compared with those depending on the gigantic surge that rushes to the height of 60 or 70 feet into the cul de sac of the Bay of Fundy . All these , and similar differences connected with tidal action ...
Página 34
... north and 17 ° south of the equator ; that inland seas , like the Baltic and Mediterranean , though communicating with the ocean , are less salt than the ocean ; and though the saltness of the sea be pretty uniform at great depths ...
... north and 17 ° south of the equator ; that inland seas , like the Baltic and Mediterranean , though communicating with the ocean , are less salt than the ocean ; and though the saltness of the sea be pretty uniform at great depths ...
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Palavras e frases frequentes
abundant accumulations agency argillaceous arrangement aspect basalts beds bituminous bones calcareous carbonate carboniferous chalk chemical chiefly clay coal coal-measures colour composed composition conglomerates coral crust crustacea crystalline deposits Devonian distinct districts drift earth elevation England eocene epoch estuaries existing extinct fauna feet felspar fishes fissures flint formation forms fossil fresh-water genera genus geological geologist globe gneiss granite gravel greensand greenstone grits heat hence hornblende igneous rocks known lakes laminated land lava layers lias lignites lime limestone lower marine marls masses matter metamorphic mica-schist mineral miocene mountain nature numerous occur ocean Octavo old red sandstone oolite organic origin paleozoic peculiar period Permian phenomena plants and animals pleistocene pliocene present quartz regions remains reptiles rivers sand schists shales shells siliceous silt Silurian species stone strata stratified structure student surface temperature term tertiary texture thickness tion Triassic upper variety vegetable volcanic Wealden
Passagens conhecidas
Página 113 - Bright ran at one time a great hazard, and suffered considerable pain from accidentally plunging one of his legs into the hot clay. * From whatever spot the sulphur is removed, steam instantly escapes ; and, in many places, the sulphur was so hot that we could scarcely handle it. From the smell, I perceived that the steam was mixed with a small quantity of sulphurated hydrogen gas.
Página 321 - ... 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 18 - In the preceding chapter we have endeavoured to explain that the object of geology is to investigate the structure of the earth, in as far as that structure is accessible to human investigation. Combining all we know of this rocky structure, from the top of the highest mountain to the bottom of the deepest mine, it forms but an insignificant film of the four thousand miles which lie between the surface and centre of the globe. This film or outer portion is spoken of as the " crust of the globe" in...
Página 113 - At the bottom of this hollow we found a caldron of boiling mud, about fifteen feet in diameter, similar to that on the top of the mountain, which we had seen the evening before ; but this boiled with much more vehemence. We went within a few yards of it, the wind happening to be remarkably favourable for viewing everv part of this singular scene.
Página 275 - Egypt, where it was largely quarried of old for the building of the Pyramids, into Asia Minor, and across Persia by Bagdad to the mouths of the Indus. It occurs not only in Cutch, but in the mountain ranges which separate Scinde from Persia, and which form the passes leading to Caboul ; and it has been followed still farther eastward into India, as far as eastern Bengal and the frontiers of China.
Página 201 - ... water ; but the case is somewhat different with beds of coal. This mineral, being chiefly composed of carbon, hydrogen, and oxygen — the same elements which enter into the composition of plants — and revealing in its mass evidence of vegetable structure, no doubt is entertained of its organic origin. But whether the plants of which it is composed were drifted down by rivers, and deposited along with layers of mud and sand in estuaries, or whether dense forests and peat-mosses were submerged,...