Law of Superposition Review

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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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What is an index fossil?

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An index fossil is a fossil that is used to define and identify a particular time period in the geological time scale. It must be widely distributed and only exist for a short period of time.

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What does the Law of Superposition help scientists determine?

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The Law of Superposition helps scientists determine the relative age of rock layers and the fossils within them.

Front

What is a fossil?

Back

A fossil is the preserved remains or traces of an organism that lived in the past.

Front

Which rock layer is typically the oldest?

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The bottom layer of sedimentary rock is typically the oldest according to the Law of Superposition.

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What is relative age?

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Relative age is the age of an object in relation to the ages of other objects, rather than an exact age.

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What is absolute age?

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Absolute age is the actual age of a rock or fossil, often determined through radiometric dating.

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What is a vertebrate?

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A vertebrate is an animal that has a backbone, such as mammals, birds, reptiles, amphibians, and fish.

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What is an invertebrate?

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An invertebrate is an animal that does not have a backbone, such as insects, arachnids, and mollusks.

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What is a carbon film?

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A carbon film is a type of fossilization where a thin layer of carbon remains after the organism decays, leaving a detailed impression.