Earth History Review

Flashcard
•
Science
•
8th Grade
•
Hard
+6
Standards-aligned
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15 questions
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1.
FLASHCARD QUESTION
Front
What does the fossil record indicate about life forms on Earth?
Back
Most life forms that existed on Earth are now extinct.
Tags
NGSS.HS-LS4-5
2.
FLASHCARD QUESTION
Front
What technological process is used to determine the age of the Earth?
Back
Radiometric dating of rocks in the Earth's crust.
Tags
NGSS.HS-ESS1-5
NGSS.HS-ESS1-6
3.
FLASHCARD QUESTION
Front
How old is the Earth estimated to be?
Back
4.6 billion years old.
Tags
NGSS.HS-ESS1-6
4.
FLASHCARD QUESTION
Front
What do air bubbles in ice cores tell us?
Back
They provide information about the atmosphere in the past.
Tags
NGSS.HS-ESS1-6
5.
FLASHCARD QUESTION
Front
If a radioactive sample has decayed to 25% of its original amount, how many half-lives have occurred?
Back
2 half-lives.
6.
FLASHCARD QUESTION
Front
What is radiometric dating?
Back
A method used to date materials by comparing the abundance of a radioactive isotope to its decay products.
Tags
NGSS.HS-PS1-8
7.
FLASHCARD QUESTION
Front
What is a half-life?
Back
The time required for half of a radioactive sample to decay.
Tags
NGSS.HS-PS1-8
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