Fossils - Preserved remains of once-living organisms, Mold fossil - forms when sediments bury an organism and the sediments change into rock; the organism decays leaving a cavity in the shape of the organism., cast fossil - forms when a mold is filled with sand or mud that hardens into the shape of the organism, petrified fossil - a fossil in which minerals replace all or part of an organism, Carbonized fossil - 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 - a fossil of a footprint, trail, burrow, egg, waste, or other trace of an animal rather than of the animal itself., Preserved fossil - forms when entire organisms or parts of organisms are prevented from decaying by being trapped in rock, ice, tar, or amber., index fossil - fossils of widely distributed organisms that lived during only one short period; these special fossils can help determine the age of the rock they were found in, Lithosphere - the rigid outer part of the earth, consisting of the crust and upper mantle.,

ESS.8.1.1. Fossils and Relative Dating Part I

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