Fossil, Preserved remains of a living organism that lived in the past, relative age , The comparison of a fossil to find the relative age of another., Preserved fossil, Fossil that forms when an organism is prevented by decaying due to being trapped, Carbonized fossil , Fossil that forms when organisms or part of one gets pressed in layers of mud or clay, Trace fossil, Fossils that forms when a footprint is left behind in harded mud or sand, Petrified fossil, Fossil that forms when minerals soak into remains creating a rock , Fossil record , gives us important information about earths past and previous environments , Rocks, ice, tar, and amber, Things fossils/ organisms can get preserved in, Absolute dating , Radio active dating used to find the exact age of a fossil, Mold fossil , Fossil that form when sediments bury an organism than changing to rock, law of superposition , Stated that each rock layer is older than the one above it, Trilobite , Key example of index fossils.

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