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Fossils7095a

Fossil definitions

QuestionAnswer
Fossils remains, imprints, or traces of prehistoric organisms that can tell when and where organisms once lived and how they lived
Perminalized remains fossils in which the spaces inside are filled with minerals from groundwater
Carbon film thin film of carbon residue preserved as a fossil
Cast a type of body fossils that forms when crystals fill a mold or sediments wash into a mold and harden into rock
Index fossil remains of species that existed on earth for a relatively short period of time
Principle of superposition states that in undisturbed rock layers the oldest rocks are on the bottom and become progressively younger toward the top.
Relative age the age of something compared with other things.
Uncomformity gap in the rock later that is due to erosion or periods without any deposition.
Absolute age age in years of a rock or other object.
Radioactive decay process in which some isotopes break down into other isotopes particle.
Half life time it takes for half the atoms of an isotope to decay.
Radiometric dating process used to calculate the absolute age of a rock.
Uniformitarianism principle starting that Earth process occuring today are similar to those that occur in the past.
Mold a type of body fossil that forms in rock when an organism with hard parts are buried decays or dissolves and leaves a cavity in the rock
Created by: sabrina&vlad5a
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