Concept:The Mohorovičić (Moho) discontinuity is a boundary layer inside the Earth that marks a change in composition and seismic wave speed.
Explanation:The Moho discontinuity separates the Earth's crust from the mantle.
It was discovered in
1909 by Croatian seismologist Andrija Mohorovičić.
Seismic wave velocities suddenly increase across this boundary, indicating a denser, different rock composition below.
Its depth varies: about
35 km below continents and roughly
7-
8 km below ocean floors.
Thus, it is not the boundary between lithosphere and asthenosphere, nor between crust and inner core.
Answer:D. Earth's crust and the mantle