The mohoroviäiä discontinuity (the moho) is the boundary between the crust and the mantle. therefore it is primarily a

Zone that separates the Earth's crust from the asthenosphere.

Explanation:

Mohorovičić discontinuity is the name given to this situation as a result of the change in seismic waves between the crust and mantle. Discontinuities in earth sciences can be defined as the boundaries separating one structure from another. Discontinuities can be seen as boundaries separating the layers in the earth as well as in smaller scale structures such as stones or rocks. However, Mohorovičić discontinuity is known as the boundary between the crust and the astenosphere. The physical parameters such as velocity, density and pressure of the seismic waves vary in this boundary. Seismic velocities increase by 10% since Mohorovičić discontinuity with respect to ground crust velocities.

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the answer you are looking for is relatively steep.

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