The Story of the Hills a book About Mountains for General Readers
The Story of the Hills a book About Mountains for General Readers
H N Henry Neville Hutchinson
The book The Story of the Hills a book About Mountains for General Readers was written by author H N Henry Neville Hutchinson Here you can read free online of The Story of the Hills a book About Mountains for General Readers book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is The Story of the Hills a book About Mountains for General Readers a good or bad book?
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" These accumulations are gradually carried away by the larger mountain streams, which in hurrying them along cause a vast amount of wear and tear ; so that their corners are worn off, and they get further and further reduced in 164 The Story of the Hills. size, becoming mere round pebbles lining the bed of the stream, and finally by the time they reach the large slow-moving rivers of the plains are mainly reduced to tiny specks of mud or grains of sand. So then the rivers and streams not only ...transport sediment, but they manufac- ture it as they go along. X\nd thus they may be considered as great grinding-mills, where large pieces of stone go in at one end, and only fine sand and mud come out at the other. The amount of land debris thus transported depends partly on the carrying power of rivers, which varies with the seasons and the annual rainfall ; partly on the size of the area drained by a river ; and again, partly on the nature of the rocks of which that area is composed. A stream, moving along at the rate of about half a mile (880 yards) an hour, which is a slow rate, can carry along ordinary sandy soil sus- pended in a cloud-like fashion in the water; when moving at the rate of two thirds of a mile (about 1, 173 yards) an hour, it can roll fine gravel along its bed ; but when the rate increases to a yard in a second, or a little more than two miles an hour, it can sweep along angular stones How the Materials were brought together, 165 as large as an egg.
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