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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