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State PCS PYQPrelims 2023

BPSC – Combined Competitive Examination · Question 23

The process that continually adds new crust is:

  1. subduction
  2. earthquake
  3. seafloor spreading
  4. convection
Show answer & explanation

Answer: (C) seafloor spreading

Explanation

At divergent mid-ocean ridges, seafloor spreading continuously creates new crust (Harry Hess).

  • (A) Incorrect

    Wrong: subduction destroys crust.

  • (B) Incorrect

    Wrong: earthquakes do not create crust.

  • (C) Correct

    Correct: magma rising at mid-ocean ridges forms new oceanic crust.

  • (D) Incorrect

    Wrong: convection drives plates but does not itself add crust.