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Summary. The theory of continental drift was the first step toward plate tectonic theory, which became the foundation upon which modern geology is built. This module describes how the work of Alfred Wegener, Harry Hess, and others led to our understanding of plate tectonics. It explains plate tectonics as the driving force behind ongoing changes on Earth.
Answers: 1. Plate: a piece of the crust. 2. Theory of Plate Tectonics-theory that explains the formation/movement of the Earthâs crust. 3. Lithosphere: outermost solid part of the crust.solid, pieces, basalt, more dense, float 4. Asthenosphere-the partially melted part of the mantle that contains convection currents that move the crustal plates.5.. Theory of Plate Tectonics-theory that explains the formation/movement of the Earthâs crust. 3. Lithosphere: outermost solid part of the crust.