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Changes over time

TermDefinition
Fossil Preserved organism
Mold Imprint of an organism
Cast When mold is filled cast fossil form
Petrified fossil When minerals replace a organism
Carbon film When a fossil is covered in a layer of carbon
Relative age Age of rock or fossil compared to another
Absolute age Actual age
Law of Superposition Old on the bottom New on the top
Fault Crack in earths crust
Unconformity Layer missing
Index fossil Fossil used to compare other layers
Geologic time scale How geologic time is divided
Era Period of time
Period Period inside a period
Created by: user-2001536
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