Which of the following waves can travel only through solid materials, so that they cannot pass through the liquid outer core of the Earth?
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → S-waves (secondary earthquake waves)
S-waves can travel only through solids. Because they cannot pass through the liquid outer core, they leave a large shadow zone, which shows that the outer core is liquid. P-waves pass through solids, liquids and gases.