Elements of Geology
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In our eReader you can find the full English version of the book. Read Elements of Geology Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book Elements of Geology
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The heads of valleys are usually without permanent streams, for they are commonly above the lowest level of the ground-water surface. The stream, therefore, does not assist in the lengthening of its valley headward, but all the other agencies which widen valleys help also to lengthen them. A valley ceases to grow by headward erosion when a permanent divide (Fig. 131) is established. This is when the wear accomplished by the run-off which a FIG. 131. Diagram of a divide. The crest of the divide ...(at a) is permanent if the conditions of erosion are the same on the two sides. Rainfall may lower it, but it cannot shift its position horizon- tally.
FIG. 132. Bad-land topography near Grand Junction, Colo. Shows many gullies. (Baker. ) enters the head of the valley is balanced by the erosion of the water which runs from the divide in the opposite direction. Thus limits are set to the growth of a valley in all three 142 PHYSICAL GEOLOGY dimensions. In depth, the limit is base level ; in width and length it is fixed by neighboring valleys.
What to read after Elements of Geology?
You can find similar books in the "Read Also" column, or choose other free books by Eliot Blackwelder to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
The heads of valleys are usually without permanent streams, for they are commonly above the lowest level of the ground-water surface. The stream, therefore, does not assist in the lengthening of its valley headward, but all the other agencies which widen valleys help also to lengthen them. A valley ceases to grow by headward erosion when a permanent divide (Fig. 131) is established. This is when the wear accomplished by the run-off which a FIG. 131. Diagram of a divide. The crest of the divide ...(at a) is permanent if the conditions of erosion are the same on the two sides. Rainfall may lower it, but it cannot shift its position horizon- tally.
FIG. 132. Bad-land topography near Grand Junction, Colo. Shows many gullies. (Baker. ) enters the head of the valley is balanced by the erosion of the water which runs from the divide in the opposite direction. Thus limits are set to the growth of a valley in all three 142 PHYSICAL GEOLOGY dimensions. In depth, the limit is base level ; in width and length it is fixed by neighboring valleys.
What to read after Elements of Geology?
You can find similar books in the "Read Also" column, or choose other free books by Eliot Blackwelder to read onlineMoreLess
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