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Name the mechanism that caused the continents to move apart and summarize how scientists discovered it in 2-3 complete sentences.

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Answer: Plate tectonics is now the widely accepted theory that Earth's crust is fractured into rigid, moving plates. In the 1960s, scientists discovered the plate edges through magnetic surveys of the ocean floor and through the seismic listening networks built to monitor nuclear testing, according to Encyclopedia Britannica.

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