Natural Science CLEP Prep Practice Exam

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Prepare for the CLEP Natural Science Exam with our comprehensive study materials and practice questions. Test your knowledge and ace the exam by mastering key concepts.

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The geologic history of Earth is divided into intervals known as:

Eons
Eras
Periods
Epochs

The correct answer is: Periods

The geologic history of Earth is divided into intervals known as periods. Eons, eras, and epochs are all divisions of time as well, but they are not commonly used to divide the geologic history of Earth. Eons generally refer to the largest divisions of time, encompassing billions of years. Eras typically cover hundreds of millions of years and are often sub-divided into periods. Epochs, on the other hand, are shorter divisions of time that represent tens of millions of years and are used to further divide periods. Therefore, while options A, B, and D are all valid divisions of time, they are not as commonly used in the geologic history of Earth as compared to periods, making option C the most accurate answer.