Relative dating and the law of superposition

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What is the Law of Superposition?

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.

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Define Relative Age.

Back

Relative Age is the age of a rock or fossil in comparison to another rock or fossil, indicating which is older or younger.

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Define Absolute Age.

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Absolute Age is the age of a rock given as the number of years since the rock formed.

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What is a sedimentary rock?

Back

Sedimentary rock is a type of rock that is formed by the accumulation and compaction of mineral and organic particles.

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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.

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What does it mean if a layer is older than another layer?

Back

If a layer is older than another layer, it means it was formed first and has been buried by younger layers.

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What is a fossil?

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A fossil is the preserved remains or traces of a once-living organism, often found in sedimentary rock.

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What is the significance of studying rock layers?

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Studying rock layers helps geologists understand Earth's history, including the age of rocks and the events that shaped the planet.

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What is a parent isotope?

Back

A parent isotope is an unstable isotope that decays into a stable daughter isotope over time.

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What is half-life?

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Half-life is the time required for half of the parent isotope in a sample to decay into a daughter isotope.