The book A Compend of Geology was written by author Leconte, Joseph, 1823-1901 Here you can read free online of A Compend of Geology book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is A Compend of Geology a good or bad book?
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In the second place, 3,000° is the fusing point under atmospheric pressure ; but under the enormous pressure of thirty to fifty miles of rock, the fusing-point would probably be much hi^er. Taking these two things into account, it seems certcdn that, if there be a universal interior liquid at all, the solid shell is much thicker than is usually supposed, and ^\tVL probable that there is no uni- versal interior liquid at all — and that volcanoes are openings into local reservoirs, not into a uni...versal sea of liquid matter. Digitized by VjOOQ IC 122 DYNAMICAL GEOLOGY. Recently there has been a tendency among geologists to accept a compromise between these extremes. It is now well known that rocks, under the combined influence of heat and water ^ fuse at a much lower temperature. This, to distinguish it from true dry fusion, is called hydrother^ mat fusion. While the temperature of true fusion is not less than 3,000®, that of hydrothermal fusion is only 600® to 800^. Now, water certainly penetrates the earth to great depths.
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