Fossil - The preserved remains or traces of an organism that lived in the past, usually more than 10,000 years ago, Mold fossil - Type of fossil that forms when sediments bury an organism and the sediments change into rock., Environmental changes - Essential to the study of fossil formation are how fossils are formed, perserved fossil - Type of fossil that forms when entire organisms or parts of organisms are prevented from decaying by being trapped in rock, ice, tar, or amber., petrified fossil - Type of fossil that forms when minerals soak into the buried remains, replacing the remains, and changing them into rock., Carbonized fossil - Type of fossil that forms when organisms or parts, like leaves, stems, flowers, fish, are pressed between layers of soft mud or clay that hardens squeezing almost all the decaying organism away leaving the carbon imprint in the rock., trace fossil - Fossil that forms when mud or sand hardens leaving a trace like footprints,trails or burrows, Fossil record - Shows the time an organism went extinct, relative age - Comparing one age of something to the age of something else, Radioactive dating - a method of dating rocks and minerals using radioactive isotopes, Law of super position - The law that all rock layers on the bottom are older then the ones on top, trilobite - key example of an index fossil,
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