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Heat transfer in a gas or liquid by the circulation of currents from one region to another. b. Fluid motion caused by an external force such as gravity
therory of continental drift
Continental drift is the movement of the Earth's continents relative to each other
occurs at mid-ocean ridges, where new oceanic crust is form through volcanic activity, and then moves away
theory of plate tectonics
the theory of Earth's outter layer is made up of plates witch have moved through out Earth's history
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