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The answer should be C) lithosphere- asthenosphere boundary. The options A) B) cannot be correct as crust and mantle divisions are based on mainly compositional properties. The l...

Most probably the answer will be (C).... Lithosphere -Asthenosphere boundary is the rheological boundary layer in earth . If we subdivide the Earth based on rheology, we see the l...

Answer (C) Lithosphere-Asthenosphere boundary. Rheological property of materials changes from rigid (in lithosphere) to plastic (in asthenosphere). This lithosphere-asthenosphere ...