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4 Cards in this Set

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  • Back
Relative age

Relative age

Definition: The age of a rock compared to the ages of rock layers.

Absolute age

Definition: The age of a rock given as the number of years since the rock formed.

Law of Superposition

Definition: The geologic principle that states that in horizontal layers of sedimentary rock, each layer is older than the layer above it and younger than the layer below it.

Extrusion

Definition: An igneous rock layer formed when lava flows onto Earth's surface and hardens.