Using radioactive decay of elements helps scientists to determine the absolute age of a fossil sample. , A half-life is the time needed for half of a sample of a radioactive substance to undergo decay. , Most fossils are found in sedimentary rocks. , An igneous intrusion can disturb rock layers. , Rocks on the bottom of a geologic column are older. , Superposition is a type of relative dating. , Convection currents in the mantle are responsible for plate tectonics which disturbs rock layers. , Fault-block mountains happen at divergent plate boundaries. , Basalt is a type of igneous rock that pushes plates away at divergent plate boundaries. ,

Geologic Time

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