
Unit 4 Checkpoint A/B
Flashcard
•
Science
•
8th Grade
•
Practice Problem
•
Hard
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15 questions
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1.
FLASHCARD QUESTION
Front
How old is the Earth?
Back
The Earth is approximately 4.6 billion years old.
2.
FLASHCARD QUESTION
Front
What is catastrophism?
Back
Catastrophism is the theory that the Earth has been shaped by sudden, violent events such as natural disasters.
3.
FLASHCARD QUESTION
Front
In which era did early horses first appear?
Back
Early horses first appeared in the Cenozoic era.
4.
FLASHCARD QUESTION
Front
What marks the end of one geologic era and the beginning of another?
Back
A mass extinction event marks the end of one geologic era and the beginning of another.
5.
FLASHCARD QUESTION
Front
How many millions of years ago did dinosaurs first appear?
Back
Dinosaurs first appeared approximately 248 million years ago.
6.
FLASHCARD QUESTION
Front
What is the significance of the Cenozoic era?
Back
The Cenozoic era is significant for the evolution of mammals and birds, and the appearance of early horses.
7.
FLASHCARD QUESTION
Front
Define geologic time scale.
Back
The geologic time scale is a system of chronological dating that relates geological strata to time.
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