Relative and Absolute Dating

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What is the Law of Superposition?

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The Law of Superposition states that in undisturbed sedimentary rock layers, the oldest rocks are at the bottom and the younger rocks are at the top.

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What is relative dating?

Back

Relative dating is a method used to determine the order of events in geological history without determining their exact age.

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What is absolute dating?

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Absolute dating is a method used to determine the actual age of a rock or fossil in years.

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What is an unconformity?

Back

An unconformity is an erosional surface that represents a break in the geological record, indicating that rock layers are missing.

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What does the term 'intrusion' refer to in geology?

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An intrusion is a body of igneous rock that has formed from magma that has cooled and solidified beneath the Earth's surface.

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How do faults affect rock layers?

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Faults are fractures in the Earth's crust where blocks of rock have moved past each other, often disrupting the order of rock layers.

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What is the significance of fossils in relative dating?

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Fossils help in relative dating by providing clues about the age of the rock layers in which they are found, as certain fossils are characteristic of specific time periods.

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What is the difference between relative age and absolute age?

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Relative age indicates whether a rock is older or younger than another rock, while absolute age provides a specific age in years.

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What is the principle of cross-cutting relationships?

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The principle of cross-cutting relationships states that a geological feature (like a fault or intrusion) that cuts through another feature is younger than the feature it cuts.

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What is a sedimentary rock?

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Sedimentary rocks are formed from the accumulation and compaction of mineral and organic particles, often in layers.