Trace or remains of an organism preserved in the earth's crust

impression left in a rock by an organism

Process by which original plant or animal parts are replaced with minerals

Model of an organism

Total amount of time since the earth was formed

method used to determine how old a rock layer is by comparing it to another rock layer

Method that determines the actual age of a rock or fossil

Fossil that provides clues to the age of the rock in which the fossil appears

length of time it takes for half of the atoms of a radioactive element to decay

An element that breaks apart or decays to form other element

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