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Information on fossil

Fossils-remains,imprints,or traces of prehistorical organisms that can tell when and where organisms once lived and how they lived.
Permineralized remains-fossils in which the spaces inside are filled with minerals from groundwater.
Carbon Flim-thin flim of carbon residue preserved as fossils.
Mold--a type of body fossil that forms in rock when an organism with hand parts is buried and decays or disslovles and leaves a cavity in the rock.
Cast-a type of body 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,were abundant and wide spread geographically and can be used by geologists to assign the ages of the rock layers.
Principle of Superposition-states that in undistrubed rock layers, the oldest rocks are on the bottom and the rock are on thebotton and the rocks are the bottom and the rocks become progressively younger toward the top.
relative age-the age of something compared with other things.
uncomformities-gap in the rock layer that is due to erosion or periods without
any deposition.
Absolute age-age in years of a rock or other object can be determined by using properties of the atoms that make up materials.
Radiacactive decay- process in which some isctopes break down into other isctopes and particles.
half life-time it takes for half the atoms of an isctope to decay.
radiometric dating-process used to calculate the absolute age of a rock by measureing the ratic of parent isctope to daughter product in a mineral and knowing the halflife of the parent.
unifromaitarianism-principle stating that earth process occuring todat are simialar to those that occured in the past.
Created by: Cav