QQuestionEarth Science
QuestionEarth Science
Which geologic era lasted the longest?
A. Cenozoic
B. Mesozoic
C. Paleozoic
D. Precambrian
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Answer
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Step 1:I'll solve this problem step by step, focusing on the geological time scale and the duration of each era.
Step 2:: Understand the Geological Time Scale
The geological time scale divides Earth's history into major eras based on significant geological and biological events. The main eras are: - Precambrian - Paleozoic - Mesozoic - Cenozoic
Step 3:: Calculate the Duration of Each Era
- Total duration: approximately $$4.06 \times 10^{9}$$ years
Let's examine the approximate duration of each era: A. Cenozoic Era: - Continues to present day B. Mesozoic Era: C. Paleozoic Era: D. Precambrian Era:
Step 4:: Compare the Durations
- Cenozoic: $$66 \times 10^{6}$$ years
Comparing the durations:
Step 5:: Identify the Longest Era
Clearly, the Precambrian Era lasted the longest by a significant margin.
Final Answer
Precambrian
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