Which one of the following is the oldest era in Geological History determining the age of various rock types?

  1. A. Precambrian
  2. B. Mesozoic
  3. C. Cenozoic
  4. D. Paleozoic

Correct Answer: A. Precambrian

Explanation

The Precambrian is the earliest part of Earth's history, set before the current Phanerozoic Eon, making it the oldest era listed.

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