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CHAPTER IX. EARTHQUAKES AND VOLCANOES.
Interior of the Earth—Illustration from Norway—Solids and Liquids—Rigidity of the Interior of the Earth—Earthquakes, how caused—Their Testimony as to the Rigidity of the Earth—Delicate Instrument for Measuring Earthquake Tremors—The Seismometer—Professor Milne’s Work in the Isle of Wight—Different Earthquake Gro............
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