Relative Dating: Rock Layers

Front

What is relative dating?

Back

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 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 intrusion in geology?

Back

An intrusion is a body of igneous rock that forms when magma pushes into existing rock layers and solidifies.

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What is a fault?

Back

A fault is a fracture or zone of fractures between two blocks of rock, which can cause earthquakes.

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What are sedimentary rocks?

Back

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

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How do sedimentary rocks usually form?

Back

Sedimentary rocks usually form horizontally as sediments settle out of water or air.

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What is the significance of fossils in relative dating?

Back

Fossils help to establish the relative ages of rock layers, as certain fossils are known to appear in specific geological time periods.

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What is the difference between relative age and absolute age?

Back

Relative age is the age of a rock layer compared to other layers, while absolute age is the actual age of a rock or fossil, often determined by radiometric dating.

Front

What is a rock layer?

Back

A rock layer is a distinct layer of rock that has formed over time, often with different characteristics than the layers above or below it.

Front

What is the principle of original horizontality?

Back

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