Dating the Earth
Flashcard
•
Science
•
8th Grade
•
Hard
+2
Standards-aligned
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15 questions
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1.
FLASHCARD QUESTION
Front
What are index fossils?
Back
Index fossils are fossils of organisms that were widely distributed but only lived during a short period of time, used to identify and date the strata in which they are found.
Tags
NGSS.MS-ESS1-4
2.
FLASHCARD QUESTION
Front
List the layers of rock from oldest to youngest: E, B, C, D, A. What does this order represent?
Back
This order represents the relative ages of the rock layers, with 'E' being the oldest and 'A' being the youngest.
Tags
NGSS.MS-ESS1-4
3.
FLASHCARD QUESTION
Front
Which letter identifies the ice layer that was most recently formed?
Back
The letter 'A' identifies the ice layer that was most recently formed.
4.
FLASHCARD QUESTION
Front
If the half-life of a radioactive group of atoms is 100 years, how old is the rock if there have been two half-lives?
Back
The rock is 200 years old.
Tags
NGSS.HS-PS1-8
5.
FLASHCARD QUESTION
Front
What does the Law of Superposition state?
Back
The Law of Superposition states that in undisturbed sedimentary rock layers, the oldest layers are at the bottom and the youngest layers are at the top.
Tags
NGSS.MS-ESS1-4
6.
FLASHCARD QUESTION
Front
What is the significance of half-life in dating rocks?
Back
Half-life is the time required for half of the radioactive atoms in a sample to decay, which helps scientists determine the age of rocks and fossils.
Tags
NGSS.HS-PS1-8
7.
FLASHCARD QUESTION
Front
How do scientists use index fossils in geology?
Back
Scientists use index fossils to correlate the age of rock layers across different geographic locations.
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