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