Question
Which of the following is not a unit of geologic time? (A) epoch (B) millennium (C) era (D) age
Ask by Mcfarlane Greene. in the United States
Feb 04,2025
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Answer
"Millennium" is not a unit of geologic time.
Solution
The correct answer is:
**(B) millennium**
**Explanation:**
In geology, the hierarchy of geologic time from largest to smallest units is as follows:
1. **Eon**
2. **Era**
3. **Period**
4. **Epoch**
5. **Age**
- **Epoch (A)**, **Era (C)**, and **Age (D)** are all recognized units of geologic time.
- **Millennium (B)**, however, is a unit of time in chronological terms, representing a thousand years, and is **not** used in the context of geologic time.
**Therefore, "millennium" is not a unit of geologic time.**
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Simplify this solution Bonus Knowledge
While epochs, eras, and ages are all official units within the geologic time scale, a millennium is a term that refers to a period of one thousand years, which is primarily used in historical contexts rather than geological ones. So, it's the odd one out! In geology, the time scale is divided into eons, eras, periods, epochs, and ages, offering a grand timeline that helps us understand Earth's history. This includes significant events like the rise of dinosaurs or mass extinction events, all encapsulated within these meaningful divisions!
