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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Which rock layer is typically the oldest in a sequence?

Back

The oldest rock layer is usually the one at the bottom of the sequence.

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What does it mean if a rock layer is younger than another?

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A younger rock layer is one that was deposited after the older layer, meaning it is above the older layer in the sequence.

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How can fossils help determine the age of rock layers?

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Fossils can indicate the relative age of rock layers; older fossils are found in lower layers, while younger fossils are found in higher layers.

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What is a fossil?

Back

A fossil is the preserved remains or traces of ancient organisms, often found in sedimentary rock.

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What is the significance of the trilobite fossil in geology?

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Trilobites are among the oldest known fossils, helping geologists date rock layers.

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What is a sedimentary rock?

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Sedimentary rock is formed from the accumulation and compaction of mineral and organic particles.

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What is the principle of original horizontality?

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The principle of original horizontality states that layers of sediment are originally deposited horizontally under the action of gravity.

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What is correlation in geology?

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Correlation is the process of matching rock layers from different locations based on their age and characteristics.

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What does it mean if two rock layers are correlated?

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If two rock layers are correlated, it means they are of the same age or have similar characteristics, even if they are located in different places.