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fossil7093b

fossil defintion

QuestionAnswer
fossils remains, imprints, or traces of prehistortic organisms once lived and how they lived
permineralized remains fossils in which the spaces inside arte filled with minerals from groundwater
Carbon flim thin flim of carbon residue preserved as a fossil
mold a type of body fossil that forms in rock when an orangism with hard parts is buried,decays or dissolves, and leaves a cavity in the rock
cast a type of body fossil 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, where abundant and widespread geographically, and can be used by geologists to assign the ages of rock layers.
principle of superposition states that in undisturbed rock layers, the oldest rocks are on the bottom and the rocks become progessively younger toward the top.
relative age the age of something compared with other things.
unconformity 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.
radioactive decay process in which some isotapes break down into other isotapes particles.
half-life time it takes for half the atoms of an isotape to decay.
uniformitarianism principle stating that Earth processes occuring today are similar to those that occured in the past.
radiometric dating process used to calculate the absolute age of rock by measuring the ratio of parent isotape to daughter product in a mineral and knowing the half-life of the parent.
Created by: Julie and John
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