Fossil - the remains of an organism preserved in rock, Paleontologist - a scientist who studies fossils, Petrified Remains - when the hard parts of an organism are replaced by minerals, Mold - an imprint when a fossil dissolves, Cast - a fossil when a mold fills up, Carbon Film - the pressed outline of a fossil, Trace Fossil  - a fossil that is indirect evidence of living things, Law of Superposition - In sedimentary rock layers, young rocks are on top and older rocks are on the bottom, Relative Age - Measuring the age of a rock by what happened 1st, 2nd, 3rd, Absolute Age - The actual date a rock formed, Index Fossil - A fossil used to find the age of a layer of rock, Radioactive decay - When an element breaks down into another element, Half-Life - the time it takes for half a radioactive element to decay, Era - Huge section of geologic time, Period - a division of time in an era, Epoch - a division of time in a period,

FOSSILS AND GEOLOGIC TIME

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