The Lehmann Discontinuity is between:

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A. Crust and Mantle A.

B. Mantle and Outer Core B.

C. Outer and Inner Core C.

D. Crust and Lithosphere D.

The Lehmann Discontinuity is between the Outer and Inner Core.

Key Details:

The Lehmann Discontinuity was discovered in 1936 by Danish seismologist Inge Lehmann.
She identified this boundary based on how seismic P-waves behaved as they travelled through the Earth's core. She noticed that P-waves would speed up suddenly at a certain depth within the core.
This abrupt increase in velocity indicated a change in material properties. It marked the transition from the liquid iron-nickel alloy of the outer core to the solid iron-nickel inner core, which is solid due to immense pressure despite its high temperature.

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