What is an index fossil?
M + M LC1 Review

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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
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
What does the law of superposition state?
Back
The law of superposition states that in undisturbed horizontal sedimentary rock layers, the oldest layers are at the bottom and the youngest layers are at the top.
3.
FLASHCARD QUESTION
Front
What type of rock is most commonly associated with fossils?
Back
Fossils are most commonly found in sedimentary rock.
4.
FLASHCARD QUESTION
Front
What is sedimentary rock?
Back
Sedimentary rock is a type of rock that is formed by the accumulation and compaction of mineral and organic particles, often containing fossils.
5.
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 solidifies. Intrusions are always younger than the rock layers they cut through.
6.
FLASHCARD QUESTION
Front
What is the difference between igneous, sedimentary, and metamorphic rocks?
Back
Igneous rocks form from cooled magma or lava, sedimentary rocks form from the accumulation of sediments, and metamorphic rocks form from the alteration of existing rocks due to heat and pressure.
7.
FLASHCARD QUESTION
Front
What is the significance of the Grand Canyon in geology?
Back
The Grand Canyon provides a visible record of geological history, showcasing various rock layers and fossils that help scientists understand Earth's past.
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