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Eduncle posted an MCQ
October 18, 2019 • 16:49 pm 0 points
  • IIT JAM
  • Geology (GG)

A schematic diagram of a divergent plate boundary, with arrows indicating directions of plate movement, is given below.

Which one of the following statements is NOT true for points P, Q, R and S, if the spreading rate for both the plates is uniform and same through time and space?

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    Eduncle Best Answer

    The grey zone is the region of eruption of magma. As we move away from this zone, the age of the rocks increase progressively. The distance of the point P from the grey zone is equal to the distance of point S from the grey zone. Since spreading rate for both the plates is uniform, rocks at P & S have the same age. So, statement (A) is correct.
    The distance of R from the grey zone is half the distance of s from the grey zone. So, the rocks at S are twice as old as those at R. So, statement (B) is also correct. Since the point Q lies in the grey zone which represents the zone of magma enuption, the age of rocks at Q is O Ma. So, statement (C) is also correct. The age of rocks decrease progressively from P to Q & then increase as we move from Q to S.
    So, statement (D) is not correct.
    Hence, (D) is the answer.

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