Geological Time Scale
Flashcard
•
Science
•
8th - 12th Grade
•
Practice Problem
•
Hard
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15 questions
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1.
FLASHCARD QUESTION
Front
What is the Great Cambrian Explosion?
Back
A significant event in Earth's history when most major groups of animals first appeared in the fossil record.
2.
FLASHCARD QUESTION
Front
What is an Eon?
Back
A unit of geological time equal to a billion years.
3.
FLASHCARD QUESTION
Front
What was The Great Dying?
Back
A mass extinction event that occurred 252 million years ago, marking the end of the Permian Period.
4.
FLASHCARD QUESTION
Front
What is the Geological Time Scale?
Back
A chronological chart that shows the events and past lives of organisms in Earth's history.
5.
FLASHCARD QUESTION
Front
What is an Epoch?
Back
A division of periods in geological history.
6.
FLASHCARD QUESTION
Front
What does the Law of Superposition state?
Back
In undisturbed sedimentary rock layers, the oldest layers are at the bottom and the youngest are at the top.
7.
FLASHCARD QUESTION
Front
What is a Period in geological time?
Back
A subdivision of an era in the geological time scale.
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