Rocks in continental crust are as old as blank years

A. 200 million

b. 44 million

C. 4.4 billion

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.