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“Chapter 9’s hypothetical submarine sets a course due east from the bulge of Brazil, reaching the young rocks of the mid-Atlantic ridge halfway across. (b) Sea-floor spreading and (c) the deep and slow convection currents that drive the movements of the plates.”
“The asthenosphere, in its capacity as a quasi-liquid, has convection currents that extend throughout its whole surface, under the entire area of the plates.”
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