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709 3a

Fossil definitions

QuestionAnswer
Perminerlized remains fossils in which the spaces inside are filled with minerals from groundwater
Fossil reamins,imprints,or traces of prehistoric organisms that can tell when and where oraganism once lived and how they lived
carbonfilm thin film of carbon residue preserved asa fossil
mold a type of body fossil that forms in rock when an organism with hard partsis buried,decaysor dissolves,andleaves a cavity in the rock
cast a type of body fossil that formswhen crystals fill a mold or sediments wash into amold and hardens a rock
index fossil remains of species that existed on earth for a relatively short period of time, were adundant and widespread geographically and can be used bygeologist to assign the ages of rock layers
principle of superpostion states that in undistured rodk layers, the oldest rocks are on the bottom and the rock becomes progressively yonger toward the top
Created by: leottheresa
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