At the boundary between the mantle and the outer core,there is an abrupt change in chemical composition and this produces a "jog" in the melting curve.

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This is true. The boundary between the mantle and the outer core is marked by a sudden increase in density, pressure, and temperature, which leads to a change in chemical composition and produces a "jog" in the melting curve.

At the Boundary Between the Mantle and the Outer Core,there