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Q: With reference to the interior of the earth consider the following statement : 1. P–waves vibrate perpendicular to the direction of the wave 2. The mean thickness of oceanic crust is 5 km 3. S–waves can travel through solids, liquids and gaseous materials Which of the statement given above is/are correct?
  • A. 1 and 3 only
  • B. 2 only
  • C. 2 and 3 only
  • D. 1, 2 and 3
Correct Answer: Option B - P-waves are like sound waves and they vibrate parallel to the direction of waves. It can travel from solid, liquid and gas also. S-waves may travel only across solid mediums. The crust of the earth varies along different positions like its about 30 km beneath continent, but 5km below the oceanic floor.
B. P-waves are like sound waves and they vibrate parallel to the direction of waves. It can travel from solid, liquid and gas also. S-waves may travel only across solid mediums. The crust of the earth varies along different positions like its about 30 km beneath continent, but 5km below the oceanic floor.

Explanations:

P-waves are like sound waves and they vibrate parallel to the direction of waves. It can travel from solid, liquid and gas also. S-waves may travel only across solid mediums. The crust of the earth varies along different positions like its about 30 km beneath continent, but 5km below the oceanic floor.