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Assertion (A): Basalt armour can be smaller than limestone armour for the same wave.
Reason (R): Its greater density raises the relative density term in the stability formula.

  • A.Both A and R are true, but R is not the correct explanation of A
  • B.A is true but R is false
  • C.A is false but R is true
  • D.Both A and R are true, and R is the correct explanation of A

Answer: D

Both are true and the reason gives the dependence, and density enters cubed in the mass calculation. The saving in volume can be substantial. Transport cost may offset part of the gain. Source and haul distance both enter the comparison.

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