Earthquakes occur every year, all over the world. These dramatic and unexpected happenings arouse the curiosity of everyone, young and old. Just what happens in the earth, and why? In this book the answer of modern geology is given—the theory of the currents in the earth's liquid mantle, which has superseded the discarded hypothesis of quakes' resulting from shrinkage of the earth. The mantle concept, along with the associated activity of volcanoes and the increasingly supported theory that the continents float upon the mantle, is explained by a clear text accompanied by explicit and striking drawings.
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