Earth liquid outer core is the property of Earth's interior causes the S-waves to stop at 2900 km.
What is a Wave?
This is defined as disturbance or oscillation that travels through space-time, accompanied by a transfer of energy.
S waves can travel through only solids and not liquids while P-waves can which was why this scenario happened.
The Earth interior is composed of the Crust and mantle and their components determines the propagation of the two waves.
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