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Rock Record
Ch.4 Fossils
Definition | Term |
---|---|
Remains or traces of an organism that lived long ago | fossil |
Imprint or hollow in rock that is shaped like and made by an organism | mold |
Mold filled with hardened sediments | cast |
Hardened tree sap | amber |
States that each undisturbed sedimentary rock layer is older than the layer above it | law of superposition |
Age of an object compared to the age of another object | relative age |
Fossil used to help determine the relative age of rock layers | index fossil |
natural fuel that was formed from the remains of living things | fossil fuel |