Wave A: The Boundary Of The Outer Core

Wave A is the S-wave Because the velocity starts at 4 and it reflects at 2,900 km. also known as the outer core. Wave B is the P-wave because the velocity starts at 8 and it refracts at 2,900 km. and it refracts at 5,100 km. also known as the inner core. The mantle starts at 1,800 km. because wave A and wave B both refract at that point and the outer core starts at 2,900 km. because wave A reflects from that point and wave B refracts at that point. So the boundary from the mantle to the outer core 1,100 km. The boundary of the inner core is 5,100 km. because wave B is also known as the P-wave refracts at that point, and the boundary of the outer core is 2,900 km. because wave B refracts at that point and wave A reflects at that point.
Planetary