College PhysiographyMacmillan, 1914 - 837 páginas |
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Términos y frases comunes
Alaska alluvial fans Amer Arctic Atlantic basins belts Bull canyon cause cliff climate coast line cone continental continental shelf continents cool crater crust currents delta denudation deposits depth drainage drift earth earthquake erosion eruption extend fall fault fault plane feet flow Geog Geography geological giving rise glacial gorge hanging valleys heat horse latitudes humid ice sheet influence irregular islands Isostasy Journ Labrador Current lakes land lava layers lithosphere loess low pressure areas lower melting miles mineral moraine mountain movement North ocean water peneplain plains plateau pressure rain rainfall regions result river rock fragments sand sea level sediment side slope snow soil southern square miles strata stream supply surface Survey temperature tion topography trade winds tropical U. S. Geol uplift vapour variation varies volcanic volcanic cones warm waves weathering wind Yakutat Bay York zone
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Página 151 - Every river appears to consist of a main trunk, fed from a variety of branches, each running in a valley proportioned to its size, and all of them together forming a system of valleys, communicating with one another, and having such a nice adjustment of their declivities, that none of them join the principal valley, either on too high or too low a level...
Página 151 - ... such a nice adjustment of their declivities, that none of them join the principal valley, either on too high or too low a level, a circumstance which would be infinitely improbable if each of these valleys were not the work of the stream that flows in it.
Página 393 - ... 1. The fracture of the rod;, which causes a tectonic earthquake, is the result of elastic strains, greater than the strength of the rock can withstand, produced by the relative displacements of neighboring portions of the earth's erust.
Página 726 - These tendencies are combined together, and cause the trade-winds to blow from the NorthEast in the northern hemisphere, and from the South-East in the southern hemisphere. The...
Página 814 - It is strictly up to date, embracing the results of the latest researches, and duly recognizing the work of contemporary investigators ; also it is made admirable mechanically by clear typography, good paper, excellent illustrations, and a full index." — National Geographic Magazine. "A book brimful of facts obtained by workers in divers fields. The work forms a highly important addition to our practical knowledge of geology." — Scientific American. THE MACMILLAN COMPANY...
Página 814 - An Introduction to Geology By WILLIAM B. SCOTT Blair Professor of Geology and Palaeontology in Princeton University Second Edition...
Página 393 - The fracture of the rock, which causes a tectonic earthquake, is the result of elastic strains, greater than the strength of the rock can withstand, produced by the relative displacements of neighboring portions of the earth's crust. 2. These relative displacements are not produced suddenly at the time of the fracture, but attain their maximum amounts gradually during a more or less long period of time. 3. The only mass movements that occur at the time of the earthquake are the sudden elastic rebounds...
Página 360 - Tarr and Lawrence Martin, Recent Changes of Level in the Yakutat Bay Region, Alaska.
Página 394 - The earthquake vibrations originate in the surface of fracture; the surface from which they start has at first a very small area, which may quickly become very large, but at a rate not greater than the velocity of compressional elastic waves in th< rock.
Página 607 - Tuve, director of the department of terrestrial magnetism of the Carnegie Institution of Washington. In a brief address by Vannevar Bush, Dr.