A Text book of Geology for Use in Universities Colleges Schools of Science Et
A Text book of Geology for Use in Universities Colleges Schools of Science Et
Pirsson, Louis V. (Louis Valentine), 1860-1919
The book A Text book of Geology for Use in Universities Colleges Schools of Science Et was written by author Pirsson, Louis V. (Louis Valentine), 1860-1919 Here you can read free online of A Text book of Geology for Use in Universities Colleges Schools of Science Et 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 for Use in Universities Colleges Schools of Science Et a good or bad book?
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153, in northern California, and in- cluding in Oregon and Washington Mt. Hood (11, 225), Mt. Adams (12, 307), Mt. Rainier (Tacoma) (14, 408), and Mt. Baker (10, 703), 196 TEXT-BOOK OF GEOLOGY Fig. 154. Eruption of Vesuvius, April, 1906. Seen from Boscotrecase. The volcano is about 4000 the ash cloud over 17, 000 feet high. IGNEOUS AGENCIES; VOLCANOES 197 are volcanoes, which are now quiescent, or have recently become ex- tinct. Mt. Etna, on the coast of Sicily, rises about 11, 000 feet above s...ea-level, and the diameter of the base of the conical pile is about 30 miles. The lower slopes are gentle and studded with many small, minor, or parasitic, cones. Character of Eruptions. At volcanic vents three things may be ejected, gases, liquids consisting of molten rock, and solid material in the form of fragments, and the nature of a volcanic eruption de- pends largely on the proportions and relations of these three things. If the eruption is violent and explosive in character then the gases have been the chief factor in its production, and solid fragmental material is the result ; if, on the other hand, it is quiet in its opera- tion, liquid rock, or lava, is the main product, and the gases play a less important role.
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