The shield portion of the craton is underlain by ____ age rocks and was tectonically ____.

Question

Quizplus · Accepted Answer

The term "Precambrian" refers to the time period before the Cambrian period, which began approximately 541 million years ago. Therefore, choices A and B are incorrect because they both refer to a specific time period within the Precambrian. The shield portion of the craton is characterized by rocks that are generally older than 541 million years, which is why the correct answer must refer to the Precambrian. Additionally, the shield portion of the craton is considered tectonically stable and inactive, which eliminates choices D and E. Therefore, the correct answer is C: Precambrian, inactive.

The Shield Portion of the Craton Is Underlain by ____