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Sciences, vol. i. . Geikie, Geological Sketches at Home and Abroad, p. 271 . Prestwich, Geology, vol. i. p. 370, quoting from Richthofen. The origin of geysers is variously explained; see Prestwich, Geology, vol. i. p. 170. They are probably due to heated waters suddenly converted into steam by contact with rock at a high temperature.
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