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original horizontality

A principle that says layers of rock are layed down horizontally but van be altered by the movemnts in the earth


mass of igneous rock below earths surface


a gap in the geologic record


a position in which rock layers appear can be changed by gaps in the geological record


a law that states; in undisturbed horizontal sedimentary rock layer the oldest layer is at the bottom and youngest is at the top


an igneous intrusion or fault that is younger than the layers around it

index fossil

can be used to estimate the age of rock layers cause it lived all over for a short period of time


a principle that states processes occur today as they did in the past

relative age

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

absolute age

age of a rock that has been determined by how many years have gone past since the rock was formed

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