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Relative Dating   any method of determining whether an event or object is older or younger than other events or objects  
Superpostition   a principle that states that younger rocks lie above older rocks if the layers have not been disturbed  
Geologic Column   an ordered arrangement of rock layers that is based on the relative ages of the rocks and in which the oldest rocks are at the bottom  
Unconformity   a break in the geologic record created when rock layers are eroded or when sediment is not deposited for a long period of time  


   


 

 

 

 

 

 
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