A Text book of Geology
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In our eReader you can find the full English version of the book. Read A Text book 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 A Text book of Geology
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Thence it continues on its rocky course down the valley.
5. Method of movement. The movement and condition of a glacier is almost wholly dependent on the facility with which ice breaks and unites again into solid ice when the broken surfaces are brought into contact. This quality, first noticed by Faraday and applied to Glaciers by Tyndall, is called regelation, the word meaning a freezing together again. It is easily tried by breaking a lump of ice and bringing the surfaces again into contact ...: if moist, as they are at the ordinary temperature, they at once become firmly united. A glacier moves on and accommodates itself to its uneven bed by breaking when necessary, and in its progress it may soon become as solid as before. Thus it breaks and mends itself as it goes.
Small portions of a glacier may slide along its bed, but the glacier never slides as a whole. In some places there may be an adaptation to an uneven surface by bending without breaking (which may take place if the force be ex- ceedingly slow in action) ; but this also is a means of motion of small importance, compared with the first mentioned.
What to read after A Text book of Geology?
You can find similar books in the "Read Also" column, or choose other free books by James Dwight Dana to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Thence it continues on its rocky course down the valley.
5. Method of movement. The movement and condition of a glacier is almost wholly dependent on the facility with which ice breaks and unites again into solid ice when the broken surfaces are brought into contact. This quality, first noticed by Faraday and applied to Glaciers by Tyndall, is called regelation, the word meaning a freezing together again. It is easily tried by breaking a lump of ice and bringing the surfaces again into contact ...: if moist, as they are at the ordinary temperature, they at once become firmly united. A glacier moves on and accommodates itself to its uneven bed by breaking when necessary, and in its progress it may soon become as solid as before. Thus it breaks and mends itself as it goes.
Small portions of a glacier may slide along its bed, but the glacier never slides as a whole. In some places there may be an adaptation to an uneven surface by bending without breaking (which may take place if the force be ex- ceedingly slow in action) ; but this also is a means of motion of small importance, compared with the first mentioned.
What to read after A Text book of Geology?
You can find similar books in the "Read Also" column, or choose other free books by James Dwight Dana to read onlineMoreLess
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