Multiple choice

Seismic waves that vibrate perpendicular to the direction of their path

  1. travel only through the solid part of the earth

  2. travel only through the liquid part of the earth

  3. travel through both solid and liquid parts of the earth

  4. Density of a material does not affect their propagation.
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A Correct answer
Explanation

S-wave, secondary wave or shear wave (sometimes called an elastic S-wave) is one of the two main types of elastic body waves. S-wave moves as a shear or transverse wave, so motion is perpendicular to the direction of wave propagation. S-waves are like waves in a rope. Unlike P-wave, S-wave cannot travel through the molten outer core of the earth and this causes a shadow zone for S-waves opposite to where they originate.

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