Multiple choice

The age of rocks is calculated on the basis of

  1. type of fossils present

  2. number of strata present

  3. amount of uranium present

  4. amount of lead present
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A Correct answer
Explanation

The age of rocks is primarily determined by the type of fossils present in them through the principle of faunal succession. Different fossil species existed in different time periods, so finding specific fossils helps date the rock layer. This method, called relative dating, was crucial before radiometric dating was developed. Option A correctly states this.

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