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Plate Tectonics
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"THE SURFACE OF EARTH IS NOTABLE for its dramatic mountains, beautiful plains, and intricate coastlines. Beneath the sea are equally interesting features, such as undersea mountain ranges, deep trenches, and thousands of isolated mountains. In this chapter, we examine the distribution of these features, along with the locations of earthquakes and volcanoes, to explore the theory of plate tectonics."

From: Exploring Geology
by Stephen Reynolds, et al