College Physiography

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Macmillan, 1914 - Geology - 837 pages
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Page 177 - 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...
Page 421 - ... 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.
Page 422 - ... 4. 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 the rock. 5. The energy liberated at the time of an earthquake was, immediately before the rupture, in the form of energy of elastic strain of the rock.
Page 754 - 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...
Page 388 - Tarr and Lawrence Martin, Recent Changes of Level in the Yakutat Bay Region, Alaska.
Page 421 - The only mass movements that occur at the time of the earthquake are the sudden elastic rebounds of the sides of the fracture towards positions of no elastic strain; and these movements extend to distances of only a few miles from the fracture.
Page 520 - Every river entering these has cut another canon; every lateral creek has cut a canon ; every brook runs in a canon; every rill born of a shower, and born again of a shower, and living only during these showers, has cut for itself a canon ; so that the whole upper portion of the basin of the Colorado is traversed by a labyrinth of these deep gorges.
Page 306 - The Pleistocene Glaciation of North America Viewed in the Light of our Knowledge of Existing Continental Glaciers,
Page 148 - It can be proved mathematically that all freely moving bodies on the earth's surface arc deflected toward the right in the northern hemisphere and toward the left in the southern hemisphere.
Page 387 - The supposed recent subsidence of the Massachusetts and New Jersey coasts.

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