Fossil, the preserved remains or traces of once living things, hard, the type of material that is more likely to become a fossil, Fossil Record, provides evidence about the history of life on Earth and how groups of organisms have changed over time, Petrified Fossil, minerals replace all of part of the organism. The organism is said to have been "turned to stone.", Fossil Mold, hollow area in sediment in the shape of the organism, Fossil Cast, a copy of the organism's shape made when the mold is filled in with sediments, Trace Fossil, provide evidence of activities of ancient organisms, Preserved Remains, the actual organism has been preserved with little or no change, Index Fossil, fossil that helps us understand when different layers of rock were formed because we know its age, Law of Superposition, states that the top rock layer and its fossils are the youngest and the bottom is the oldest., Magma Intrusion, may push into rock layers; is younger than the layers it pushes into.

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