(A) the direction of motion of the particles in the medium.
Mobile Navigation of the primary wave.
(B) the direction of motion of the particles in the medium.
The direction of motion of the secondary wave.
(C) the direction of motion of the waves and the secondary wave.
The earthquake Center.
(A) the movement of particles in the medium.
The primary direction of the wave
(b) the movement of particles in the medium.
Direction of the secondary wave
(c) the direction of the primary waves were secondary waves.
It was through the earthquake center.