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., petrified fossil, Type of fossil that forms when minerals soak into the buried remains, replacing the remains, and changing them into rock., preserved 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

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