Continental Drift - the idea that the continents were once fused together but slowly drifted apart over time, Supercontinent - one giant continent into which most or all of the continents were assembled long ago, Superposition - the condition of undisturbed sedimentary rock in which the oldest layer is at the bottom and the youngest layer is at the top, Tectonic Plates - more than a dozen distinct plates that make up Earth’s surface and slowly move in different directions, Theory - an explanation for why a phenomenon,

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