What is the Law of Superposition?
Index Fossils/ Law of Superposition

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Science
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8th Grade
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Hard
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1.
FLASHCARD QUESTION
Front
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.
2.
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 must have lived for a relatively short period of time and be widely distributed.
3.
FLASHCARD QUESTION
Front
Why are index fossils important in geology?
Back
Index fossils help geologists date rock layers and correlate the age of rocks in different locations.
4.
FLASHCARD QUESTION
Front
What is an intrusion in geology?
Back
An intrusion is a body of igneous rock that forms when magma pushes into existing rock layers and cools.
5.
FLASHCARD QUESTION
Front
What is the difference between an intrusion and an extrusion?
Back
An intrusion occurs when magma cools and solidifies beneath the Earth's surface, while an extrusion occurs when lava erupts onto the surface and cools.
6.
FLASHCARD QUESTION
Front
What does it mean if a rock layer is described as 'undisturbed'?
Back
Undisturbed rock layers have not been altered by geological events such as folding, faulting, or erosion.
7.
FLASHCARD QUESTION
Front
What is a fault in geological terms?
Back
A fault is a fracture or zone of fractures between two blocks of rock, which can cause displacement.
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