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Relative Age of Rock

Bonnie Branch 6th Grade - 9-2 / Finding the Relative Age of Rocks

TermsDefinition
relative age A rock's age compared to the ages of other rocks.
absolute age The number of years since the rock formed.
law of superposition In horizontal sedimentary rock layers, the oldest is on the bottom and each higher layer is younger than the layer beneath it.
uncomformity A gap in the geologic record showing where some rock layers have been lost because of erosion.
fault A break in Earth's crust.
intrusion An igneous rock layer forms when magma pushes into bodies of rock beneath the surface and cools (always younger than the rock layers it pushed into).
extrusion Lava that cools and hardens into igneous rock on the surface (always younger than the layers below it).
index fossil A fossil that is widely distributed and represents a type of organism that existed only briefly.
Created by: kjanelli
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