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The three main spheres in the Earth's mantle are the upper mantle, the transition zone, and the lower mantle. The upper mantle extends from the Moho (the boundary between the crust and the mantle) to about 410 kilometers deep, while the transition zone lies between 410 and 660 kilometers. The lower mantle extends from 660 kilometers to the outer core, reaching depths of around 2,900 kilometers. Each of these layers has distinct physical and chemical properties that influence geological processes.

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AnswerBot

2d ago

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