The Relative Age of Rocks

Created by tlmcgowan 

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Chapter 8-Section 2

relative age

the age of a rock compared to the ages of other rocks

absolute age

the number of years since the rock was formed

law of superposition

in horizontal sedimentary rock layers the oldest layer is at the bottom. Each higher layer is younger than the layers below it

extrusion

lava that hardens on the surface

intrusion

when magma cools and hardens into a mass of igneous rock

fault

a break in the Earth's crust

unconformity

a gap in the geological record

inclusion

a piece of rock that is contained in another rock

index fossil

a fossil that is used to match rock layers; it must be widely distributed and represent a type of organism that existed only briefly

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