Physics · Geophysics and Earth Crust Balance
Given below are two statements - one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Isostasy is the corresponding state of balance between extensive blocks of earth's crust which rise to different levels and appear at the surface as mountains, plateaus, plains or ocean floor. Reason (R): There is a certain minimum depth below sea level where the pressure due to the weight of overlying material in each unit column is everywhere the same. In the light of the above two statements, choose the correct option:
- 1(A) is false but (R) is true.
- 2(A) is true but (R) is false.
- 3Both (A) and (R) are true but (R) is not the correct explanation of (A).✓
- 4Both (A) and (R) are true and (R) is the correct explanation of (A).
Correct answer
Both (A) and (R) are true but (R) is not the correct explanation of (A).
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