Age of Earth
Flashcard
•
Science
•
7th - 9th Grade
•
Practice Problem
•
Hard
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15 questions
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1.
FLASHCARD QUESTION
Front
What is the absolute age of a rock?
Back
The number of years that have passed since the rock was formed, such as 'this basalt layer is 1000 years old +/- 20 years'.
2.
FLASHCARD QUESTION
Front
What is the relative age of a rock?
Back
The age of a rock compared to the ages of other rocks, such as 'this rock is older than the rest in the area'.
3.
FLASHCARD QUESTION
Front
What marks the beginning of geologic time?
Back
Precambrian Time.
4.
FLASHCARD QUESTION
Front
What is an example of extrusion in geology?
Back
Lava that hardens on the Earth's surface, forming igneous rock.
5.
FLASHCARD QUESTION
Front
What does the law of superposition state?
Back
In undisturbed horizontal layers of sedimentary rock, the oldest rocks are found at the bottom, and each higher layer is younger than the layer(s) below it.
6.
FLASHCARD QUESTION
Front
What is an unconformity in geology?
Back
A gap in the geological record that represents a period of erosion or non-deposition.
7.
FLASHCARD QUESTION
Front
What is an index fossil?
Back
A fossil that is used to define and identify a particular time period in the geological time scale.
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