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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