The Colorado Canyon Some of Its Lessons volume 1 No9
The Colorado Canyon Some of Its Lessons volume 1 No9
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In our eReader you can find the full English version of the book. Read The Colorado Canyon Some of Its Lessons volume 1 No9 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 The Colorado Canyon Some of Its Lessons volume 1 No9
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He is then really prepared to apprehend that the canyon, as we see it to-day, is simply a modest beginning in the vast task that nature has assigned to the Colorado river the task of cutting down its channel, and of receiving and carrying away to the sea all the rock waste weathered and washed from the plateaus, until the plateaus are worn down to lowlands. Great as the canyon is, it is only a young valley. Vast as may be the work already accomplished by the energetic river, this work is only a... fair beginning in the enormous task that the river has undertaken.
It is not to be wondered at, if a beginner in Earth science finds it difficult to imagine the actual accomplishment of so great a task as the removal of the broad plateaus by the slow processes of weathering and washing. Even Colonel Greenwood, who sixty years ago attributed so much work to rain and rivers, did not venture to state so extreme a conclusion that, after the valleys are carved, the hills must be worn away. True, Ramsay had somewhat earlier perceived that the long- continued action of seashore waves, supplementing the action of subaerial erosion, would eventually produce a " plain of marine erosion ; " but it was the American explorer and geologist, Powell, who first brought forward the view that a plain of erosion may be produced without the aid of marine processes ; and the very facts which led Powell to this view are seen in the walls of the Colorado canyon.
What to read after The Colorado Canyon Some of Its Lessons volume 1 No9?
You can find similar books in the "Read Also" column, or choose other free books by Davis, William Morris, 1850-1934 to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
He is then really prepared to apprehend that the canyon, as we see it to-day, is simply a modest beginning in the vast task that nature has assigned to the Colorado river the task of cutting down its channel, and of receiving and carrying away to the sea all the rock waste weathered and washed from the plateaus, until the plateaus are worn down to lowlands. Great as the canyon is, it is only a young valley. Vast as may be the work already accomplished by the energetic river, this work is only a... fair beginning in the enormous task that the river has undertaken.
It is not to be wondered at, if a beginner in Earth science finds it difficult to imagine the actual accomplishment of so great a task as the removal of the broad plateaus by the slow processes of weathering and washing. Even Colonel Greenwood, who sixty years ago attributed so much work to rain and rivers, did not venture to state so extreme a conclusion that, after the valleys are carved, the hills must be worn away. True, Ramsay had somewhat earlier perceived that the long- continued action of seashore waves, supplementing the action of subaerial erosion, would eventually produce a " plain of marine erosion ; " but it was the American explorer and geologist, Powell, who first brought forward the view that a plain of erosion may be produced without the aid of marine processes ; and the very facts which led Powell to this view are seen in the walls of the Colorado canyon.
What to read after The Colorado Canyon Some of Its Lessons volume 1 No9?
You can find similar books in the "Read Also" column, or choose other free books by Davis, William Morris, 1850-1934 to read onlineMoreLess
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