Geological Timescale
Flashcard
•
Science
•
7th Grade
•
Easy
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15 questions
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1.
FLASHCARD QUESTION
Front
How old is the Earth?
Back
Approximately 4.6 billion years old.
2.
FLASHCARD QUESTION
Front
What is the oldest era in the geological timescale?
Back
Precambrian.
3.
FLASHCARD QUESTION
Front
What determines when an era or period begins or ends?
Back
Mass Extinction.
4.
FLASHCARD QUESTION
Front
What is the main purpose of the geologic time scale?
Back
To organize the major eras of Earth's history.
5.
FLASHCARD QUESTION
Front
Which periods are found in the Mesozoic Era?
Back
Triassic, Jurassic, Cretaceous.
6.
FLASHCARD QUESTION
Front
What are the four main eras of the geological timescale?
Back
Precambrian, Paleozoic, Mesozoic, Cenozoic.
7.
FLASHCARD QUESTION
Front
What significant event marks the end of the Paleozoic Era?
Back
The Permian-Triassic extinction event.
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