
Geologic History: ESRT page 8
Flashcard
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Science
•
9th Grade
•
Practice Problem
•
Hard
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1.
FLASHCARD QUESTION
Front
What is geologic time?
Back
Geologic time is the timeline of Earth's history, divided into eons, eras, periods, and epochs, based on significant geological and biological events.
2.
FLASHCARD QUESTION
Front
What defines the beginning and end of geologic time units?
Back
Units of geologic time are defined by major changes in life forms, such as mass extinctions or significant evolutionary developments.
3.
FLASHCARD QUESTION
Front
What is an index fossil?
Back
An index fossil is a fossil that is used to define and identify a particular time period in the geologic time scale, characterized by a narrow time frame and wide geographic distribution.
4.
FLASHCARD QUESTION
Front
Which era is known for the first appearance of fish?
Back
The Paleozoic Era is known for the first appearance of fish.
5.
FLASHCARD QUESTION
Front
What are the three periods of the Mesozoic Era?
Back
The three periods of the Mesozoic Era are the Triassic, Jurassic, and Cretaceous periods.
6.
FLASHCARD QUESTION
Front
What is the significance of the Permian period?
Back
The Permian period is significant because it ended with the largest mass extinction in Earth's history, known as the Permian-Triassic extinction event.
7.
FLASHCARD QUESTION
Front
When did the Jurassic period occur?
Back
The Jurassic period occurred approximately 201 to 145 million years ago.
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