What are index fossils?
Relative Age Dating Practice

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Science
•
8th Grade
•
Hard
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1.
FLASHCARD QUESTION
Front
Back
Index fossils are fossils of organisms that were abundant, widespread, and existed for a relatively short period of geological time. They are used to help date and correlate the age of rock layers.
2.
FLASHCARD QUESTION
Front
Why are trilobites considered good index fossils?
Back
Trilobites are considered good index fossils because they were abundant, widespread geographically, and lived for a short time period.
3.
FLASHCARD QUESTION
Front
What does the law of crosscutting state?
Back
The law of crosscutting states that a geological feature (like a fault or intrusion) is younger than any rock layer it cuts through.
4.
FLASHCARD QUESTION
Front
What is relative age?
Back
Relative age is the age of a rock or fossil in comparison to the ages of other rocks or fossils, rather than an exact age.
5.
FLASHCARD QUESTION
Front
How do sedimentary rocks usually form?
Back
Sedimentary rocks usually form horizontally through the accumulation and compaction of sediments.
6.
FLASHCARD QUESTION
Front
What is the difference between absolute age and relative age?
Back
Absolute age is the actual age of a rock or fossil, often determined by radiometric dating, while relative age is its age compared to other rocks or fossils.
7.
FLASHCARD QUESTION
Front
What is an example of a geological feature that can be dated using relative age dating?
Back
An example of a geological feature that can be dated using relative age dating is a fault, which can be determined to be younger than the rocks it cuts through.
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