Determining the Age of Rocks

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Rock strata
Layers of sedimentary rock
Sediment
Silt, sand, rocks, fossils, and other matter carried and deposited by water, wind, or ice
Sedimentary Rock
rocks formed when soil and other materials on the Earth's surface are deposited, buried, squeezed and cemented together
Relative age
rock age compare with ages of other rocks
Absolute age
number of years since rock formed
Law of Superposition
states that, in horizontal sedimentary rock layers, the oldest layer of rock is at the bottom and each higher layer is younger than the layer before it
Intrusion
magma cools and hardens into a mass beneath the surface
Index fossil
widely distributed and represent a type of organism that existed briefly
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