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all the natural processes that wear away earth and rock


the data used to draw a conclusion


the process of finding something by digging for it


no longer living on the earth; having died out


the hardened skeletons or other remains of creatures of prehistoric times


scientists who study the earth's crust and the rocks it is made of


scientific suggestions based on what is known so far


a scientist who studies prehistoric life


samples taken for scientific study


an idea that is based on evidence but that cannot be stated as fact

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