The Nature of Things

The Quaking Earth (5x6)

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Earthquakes & Volcanoes" Research into earthquakes and volcanic eruptions gives us much information on the earth's structure. In this program, Percy Saltzman talks with two experts on these phenomena: Dr. Walter Tovell of the Royal ontario Museum and Dr. John Hodgson, seismologist and newly-appointed Director of the Dominion Observatories.