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Flashy Fossils 7092A

Fossil Definitions

QuestionAnswer
Fossil remains, imprints, or traces of prehistoric organisms that can tell when and where organisms once lives and how they lived.
permineralized remains fossils in which the spaces inside are filled with minerals from ground water.
carbon film thin film of carbon residue pre serves as a fossil.
mold a type of body fossil that forms in rock when an organism 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 were abundant and widespread geographically, and can be used by geologists to assign the ages of rock layers.
principle of superpostition states that in undisturbed rock layers, the oldest rocks are on the bottom and the rocks become progressively younger toward the top.
relative age the age of something compared with other things.
unconfromity 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 and particles.
half-life time it takes for half the atoms af an isotape to decay.
uniformitarianism princliple stating that Earth processes occuring today are similar to those that occured in the past.
rodioactive dating process used to calculate the absolute age of rock by measuring the ratio of a parent isotape to daughter product in an mineral knowing the half-life of the parent.
Created by: emimelix3
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