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On April 25, a crater broke into a small eruption, throwing out showers of rock-material, which, however, did not reach the town, distant a mile from the foot of the volcano. On May 5, an avalanche of boiling mud, many acres wide, tumbled down from the volcano, and went roaring along the bed of the Rivière Blanche at the rate of a mile a minute.
Thousands of such faults, dykes, or depressions exist in every part of the world, all believed to be due to the gradual shrinking of the heated interior to which the solid crust has to accommodate itself, and they are especially interesting and instructive for our present purpose as showing the tendency of such fractures of solid rock-material to extend to great lengths in straight lines, notwithstanding the extreme irregularity both in the surface contour as well as in the internal structures of the varied deposits and formations through which they pass.
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