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earth science vocab

TermDefinition
fossils the imprints or remains of organisms that were once alive
lithosphere the crust of the earth it is broken doen into sections called plates
absolute age tells the actual age of a rock or fossil or how long ago an event occured
radioactive dating a means of measuring the age of material by comparing the amount of a radioactive form of an element in a rock or fossil with the amount of its decay product
relative age describes the age of an object or event in comparison to another object or event it determines which event occured earlier or later than others without giving a definite date
law of superposition a scientific law that states that in undistributed sedimentary rock layers older layers of rock lie beneath the younger ones
index fossil a fossil that is found in rock layers of only one geologic age and that is used to establish the age of the rock layer
Created by: tcanip741
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