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State PCS PYQPrelims 2023

BPSC – Combined Competitive Examination · Question 24

The theory that states 'pieces of the Earth's crust are in constant, slow motion driven by movement in the mantle' is called:

  1. the theory of continental drift
  2. the theory of Pangaea
  3. the theory of plate tectonics
  4. the theory of plate boundaries
Show answer & explanation

Answer: (C) the theory of plate tectonics

Explanation

Plate tectonics (1960s) describes rigid plates moving over the asthenosphere, driven by mantle convection.

  • (A) Incorrect

    Wrong: Wegener's theory lacked a mantle-driven mechanism.

  • (B) Incorrect

    Wrong: Pangaea is a supercontinent, not a theory of motion.

  • (C) Correct

    Correct: plate tectonics explains lithospheric plates moving over the mantle.

  • (D) Incorrect

    Wrong: not a recognised theory.