A Text book of Geology Designed for Schools And Academies
The book A Text book of Geology Designed for Schools And Academies was written by author James Dwight Dana Here you can read free online of A Text book of Geology Designed for Schools And Academies book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is A Text book of Geology Designed for Schools And Academies a good or bad book?
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In the central portions of the Interior-Continental region the thickness varies from 3, 500 feet (and still less on the northern border) to 6, 000 feet ; and it is, therefore, from one sixth to one tenth that in the Appalachian region. 4. Origin of the deposits. The material of the fragmental rocks, or those of sand, clay, mud, pebbles (the sandstones, shales, earthy sandstones and conglomerates), was "made (1) by the wear of pre-existing rocks under the action of water ; (2) by disintegration ...produced by partial decomposition ; and (3) by disaggregation from expansion and contraction due to daily and annual changes of temperature. The water was mainly that of the ocean, and the power was that of its waves and currents. But the water from the rains aided in the wear, although there were no large rivers ; and, through the carbonic acid it took up from the atmosphere, it was a great agent in the disintegration of exposed rocks, feldspar, the most common ingredient in crystalline rocks and also nearly all iron-bearing minerals, yielding more or less easily under the action.
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