File:Elementary physical geography (1907) (14791869313).jpg

Identifier: elementaryphysic00tarr (find matches)
Title: Elementary physical geography
Year: 1907 (1900s)
Authors: Tarr, Ralph S. (Ralph Stockman), 1864-1912
Subjects: Physical geography
Publisher: New York, The Macmillan company
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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Face page 253
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TOPOGRAPHIC FEATURES OF EARTHS SURFACE. 253 by successive foldings of the rocks; the plateaus have beenproduced by great elevations of the land; and many of theplains have been caused by the filling of seas from the wasteof the mountains. Many forces have cooperated to build thecontinents, but this subject is properly one of pure geology.From the present standpoint, it is enough to know that thesechanges are going on, and to recognize the fact that thecontinents are not of the same form at all times. Indeed,there seems good reason for believing that the true Ameri-can continent does not end at the present shore line, butthat its proper boundary is along the margin of the conti-nental shelf, which on the northeastern side, extends to adistance of from 50 to 100 miles from the present shore.At this point the great ocean abysses commence, and fromthe land to this point there is very little depth to the ocean.(See Fig. 128.) Physical Geography of the United States. — The best wayto illu

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