Geologic Time Scale - Grade 9 Science
This worksheet covers key concepts related to the Geologic Time Scale, including eons, eras, periods, and significant events in Earth's history.
Includes
Standards
Topics
Geologic Time Scale
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Date:
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Read each question carefully and answer to the best of your ability. Use your knowledge of the Geologic Time Scale to complete the tasks.
1. Which of the following represents the largest division of geologic time?
Era
Period
Epoch
Eon
2. The Mesozoic Era is known as the 'Age of '.
Mammals
Fish
Dinosaurs
Reptiles
3. The Geologic Time Scale is divided into units based on significant and biological events.
4. The Cambrian Explosion, a period of rapid diversification of life, occurred during the Period.
5. The Cenozoic Era is the current era of geologic time.
True
False
6. Mass extinctions mark the boundaries between different geologic periods.
True
False
Match each geologic time division with its approximate duration.
7. Eon
a. Tens to hundreds of millions of years
8. Era
b. Billions of years
9. Period
c. Millions of years
10. Briefly explain why the Geologic Time Scale is not divided into equal increments of time.
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