With reference to seismic waves and the Earth's interior, consider the following statements:
- P-waves can travel through both solids and liquids.
- S-waves cannot propagate through the liquid outer core.
- The existence of the S-wave shadow zone provided evidence for the liquid nature of the outer core.
- P-waves are completely blocked by the outer core, producing their shadow zone.
- The difference in the behaviour of P- and S-waves helps scientists infer the internal structure of the Earth.
Which of the statements given above are correct?