What is the law of superposition?
Relative and Absolute Dating

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Science
•
9th Grade
•
Hard
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1.
FLASHCARD QUESTION
Front
Back
In a sequence of sedimentary rock layers, the oldest layers are at the bottom and the younger layers are at the top.
2.
FLASHCARD QUESTION
Front
What does it mean if a rock layer is described as 'intrusive'?
Back
An intrusive rock layer is younger than the layers it cuts through because it formed from magma that cooled and solidified beneath the Earth's surface.
3.
FLASHCARD QUESTION
Front
How can you determine the relative age of rock layers?
Back
By using principles such as the law of superposition, cross-cutting relationships, and the principle of original horizontality.
4.
FLASHCARD QUESTION
Front
What is relative dating?
Back
Relative dating is a method used to determine the order of past events without determining their exact age.
5.
FLASHCARD QUESTION
Front
What is absolute dating?
Back
Absolute dating is a method used to determine the actual age of a rock or fossil, often through radiometric dating.
6.
FLASHCARD QUESTION
Front
What is a fossil?
Back
A fossil is the preserved remains or traces of a once-living organism, often found in sedimentary rock.
7.
FLASHCARD QUESTION
Front
What is the principle of original horizontality?
Back
This principle states that layers of sediment are originally deposited horizontally under the action of gravity.
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