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The word constant motion of plates means the plate are not static that is they move either towards each other(convergence),away from each other(divergence)or slide passing one another. Many features have been found on the earth crust as a result of plates being in constant motion.Also must gigantic explosions have been noticed to had occured on the earth surface due to the movement of plates such as ,volcanic eruptions, earthquakes, seafloor spreading.

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