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Fossils 709 7A

Fossil Facts

Fossils remains,imprints,or traces of phestoric orginsms that can tell when and where orginsms once lived and how they die.
Permineralized Remains Fossils in which the spaces inside are filled with minerals from groundwater.
Carbon Film thin film of carbon residue preserved as a fossil.
Mold a type of body fossilthat forms in rock when an orginism with hard parts is buried, decays or disolvesand leaves a cavity in the rock.
Cast a type of body fossil that forms when crystals fill a mold or sedimentgs wash into mold and harden into rock
Indext Fossil remains of species that existed on earth for a relatively short period of time, were abudent and wide spreadgeographically,and can be used by geoligest the ages of rock layers.
Principle Of Superposition state that is undisturbed rock layers , the oldest rock are on younger towared the top.
Relative Age the age of something compared with outher things.
Unconformity gap in the rock layer that is due to erosion or period without any deposition.
Absolute Age age, in years of rock or other object can be determined by using propoerties by using properties of the atoms that make up materials.
Radioactive Decay processing which some isotopes break down into other isotopes and perticles.
Half-life time it takes for half of the atoms of an isotope to decay.
Raidometric Dating Process used to calculate absolute age of rock by measuring the raito of parent isotope to daughter product in a minnerial and Knowing the half life