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8 Cards in this Set

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relative age
The relative age of a rock is its age compared to the ages if other rocks.
absolute age
The absolute age of a rock is the number of years since the rock formed.
law of superposition
According to the law of superstion, in horizontal sedimentary rock layers the oldest is at the bottom.
unconformity
An unconformity is a gap in the geologic record.
fault
A fault is a break in the earth's crust.
intrusion
When magma cools and hardens into a mass of ingnious rock.
extrusion
Lava that hardens ono the surface is called an extrusion.
index fossil
A fossil that is widely distibuted and represents a type of ogansism that existed only briefly