How does a convection mantle work?
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The mantle is heated from below (the core), and in areas that are hotter it rises upwards (it is buoyant), whereas in areas that are cooler it sink down. This results in convection cells in the mantle, and produces horizontal motion of mantle material close to the Earth surface.
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When water is heated, convection causes the water at the bottom to expand and become lighter. The heated molecules then rise to the top, which causes the cooler molecules to sink to the bottom. These cooler molecules then become heated.
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