NC 8.E.2 Earth History EOG Review

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What is the Law of Superposition?

Back

In undisturbed layers of sedimentary rock, the lowest layers contain the older rocks.

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What is radioactive dating?

Back

A method used by scientists to determine the age of rocks by measuring the decay of radioactive isotopes.

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What are index fossils?

Back

Fossils of organisms that were widespread but only existed for a short period of geological time, used to date rock layers.

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What does it mean if two rock layers contain the same index fossils?

Back

It suggests that the two rock layers were deposited at approximately the same time.

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What is relative dating?

Back

A method of determining the age of rocks and fossils by comparing them to other rocks and fossils.

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What can core samples from the Arctic tell us?

Back

They allow scientists to investigate Earth's climate over the past 740,000 years.

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What is an intrusion in geology?

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A body of igneous rock that has crystallized from molten magma beneath the Earth's surface.

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What is folding in geological terms?

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The bending of rock layers due to tectonic forces.

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What is the significance of volcanic deposits in geology?

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They can provide information about past volcanic activity and the environment at the time of their formation.

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What is the difference between absolute dating and relative dating?

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Absolute dating provides a specific age of a rock or fossil, while relative dating places them in a sequence without exact dates.