Index Fossils
Flashcard
•
Science
•
8th Grade
•
Practice Problem
•
Hard
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15 questions
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1.
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 geological time scale. It is typically widespread, abundant, and existed for a relatively short duration.
2.
FLASHCARD QUESTION
Front
Why are ammonites considered good index fossils?
Back
Ammonites are considered good index fossils because they were widespread in the oceans and had a short geological lifespan, making them useful for dating and correlating the age of rock layers.
3.
FLASHCARD QUESTION
Front
What are the two main characteristics of a good index fossil?
Back
A good index fossil should be widespread geographically and have a short geological lifespan.
4.
FLASHCARD QUESTION
Front
How can fossils indicate past environmental conditions?
Back
Fossils can indicate past environmental conditions by providing evidence of the types of organisms that lived in a particular area, which can suggest whether the area was once underwater, dry land, or had a different climate.
5.
FLASHCARD QUESTION
Front
What is the significance of finding a fossil in a rock layer?
Back
Finding a fossil in a rock layer can help scientists determine the relative age of the rock and the environmental conditions that existed when the organism was alive.
6.
FLASHCARD QUESTION
Front
What does it mean if a fossil is found in multiple locations around the world?
Back
If a fossil is found in multiple locations around the world, it suggests that the organism was widespread and can be used as an index fossil for correlating the age of rock layers across different regions.
7.
FLASHCARD QUESTION
Front
What is the difference between relative dating and absolute dating?
Back
Relative dating determines the age of rocks and fossils in relation to one another, while absolute dating provides a specific age or date for a rock or fossil, often using methods like radiometric dating.
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