Elementary Physical Geography An Outline of Physiography
Elementary Physical Geography An Outline of Physiography
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In our eReader you can find the full English version of the book. Read Elementary Physical Geography An Outline of Physiography 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 Elementary Physical Geography An Outline of Physiography
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Surface streams flow quickly away in their channels, but the underground waters must trickle slowly through chan- nels that are ill-adapted, spending their energy not only in forcing their way through passages that perhaps are self-made, but also in keeping the passages clear of ob- structions. The work of surface waters, therefore, is com- paratively easy and simple ; that of undergroimd drainage is vastly more difficult.
If the prevailing rock of a region be mainly of clay, or slate, or other... impervious rock, the imderground di'ainage will be close to the surface, ^ for such rocks not only pre- vent the passage of water, but they are also insoluble. In such cases the water must trickle through the top soil much in the same Avay that water passes through a filter made of sand and gravel — that is, it must flow in the spaces be- tween the particles of rock waste.
On the other hand, if the rock of a region is mainly of limestone, and more especially if the strata be broken and 132 UNDERGROUND WATERS 13-^ faulted, ^ imdergrouud drainage is apt to be very extensive.
What to read after Elementary Physical Geography An Outline of Physiography?
You can find similar books in the "Read Also" column, or choose other free books by Redway Jacques Wardlaw to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Surface streams flow quickly away in their channels, but the underground waters must trickle slowly through chan- nels that are ill-adapted, spending their energy not only in forcing their way through passages that perhaps are self-made, but also in keeping the passages clear of ob- structions. The work of surface waters, therefore, is com- paratively easy and simple ; that of undergroimd drainage is vastly more difficult.
If the prevailing rock of a region be mainly of clay, or slate, or other... impervious rock, the imderground di'ainage will be close to the surface, ^ for such rocks not only pre- vent the passage of water, but they are also insoluble. In such cases the water must trickle through the top soil much in the same Avay that water passes through a filter made of sand and gravel — that is, it must flow in the spaces be- tween the particles of rock waste.
On the other hand, if the rock of a region is mainly of limestone, and more especially if the strata be broken and 132 UNDERGROUND WATERS 13-^ faulted, ^ imdergrouud drainage is apt to be very extensive.
What to read after Elementary Physical Geography An Outline of Physiography?
You can find similar books in the "Read Also" column, or choose other free books by Redway Jacques Wardlaw to read onlineMoreLess
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