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14 February, 20:54

Rocks in continental crust are as old as blank years

A. 200 million

b. 44 million

C. 4.4 billion

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Answers (1)
  1. 14 February, 21:41
    0
    Answer: Option (C)

    Explanation: The rocks at the continental crust are present since a long time, and the oldest rocks so far encountered from the continental crust is approximately 4.4 billion years old.

    This has been determined by the Uranium-Lead dating method (Ur₂₃₈-Pb₂₀₆).

    Oceanic rocks are estimated to be of very recent age i. e about only 180 million years old.
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