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Fossils 709 7A
Fossil Facts
Question | Answer |
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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 |