This document discusses fossils and the fossilization process. It defines fossils as preserved remains or prints of organisms, and explains that fossilization requires rapid burial and mineral replacement over time. An example of how a fish can become a fossil is provided, outlining the stages from death and sinking to the seabed, to burial and lithification over millions of years, until the fossilized remains are uncovered by erosion. Different types of fossils are also identified, including molds, casts, actual remains, and petrified wood.