Unit 4 review 8th grade

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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 layers are at the bottom and the youngest layers are at the top.

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What is an Unconformity in geology?

Back

An Unconformity is a break in the geologic record that occurs when rock layers are eroded over a long period of time, resulting in a gap in the geological timeline.

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What does Relative Dating mean?

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Relative Dating is a method used to determine the age of rocks and fossils in relation to one another, without determining their exact age.

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What is the significance of Intrusions in geology?

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Intrusions are bodies of igneous rock that form when magma pushes into existing rock layers. They are younger than the layers they intrude.

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What is Pangaea?

Back

Pangaea was a supercontinent that existed during the late Paleozoic and early Mesozoic eras, where all continents were joined together.

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What is the difference between absolute age and relative age?

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Absolute age is the actual age of a rock or fossil, while relative age is its age compared to other rocks or fossils.

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What is the Law of Crosscutting Relationships?

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The Law of Crosscutting Relationships states that if a geological feature cuts through another, the feature that has been cut is older.

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What is an Intrusion?

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An Intrusion is a geological feature formed when magma cools and solidifies within existing rock layers.

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What is the purpose of geologic time scale?

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The geologic time scale is a system of chronological dating that relates geological strata to time, helping to understand Earth's history.

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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.