The remains, imprints, or traces of prehistoric

The thin film of carbon that shows the outline of an organism

Permineralized _______are fossils in which the spaces inside are filled with minerals from ground water

The age, in years, of a rock or other object

___fossils created fossilized tracks, trails, or burrows that are evidence of an organisms activity

Fossil created when a sediment fills a mold and hardens

Scientists who study fossils are called?

The time it takes for half of the atoms in an isotope to decay

Radioactive______ is the breaking down of some isotopes into others and particles

A(n)_____fossil is the remains of an organism that lived during a specific time that is used to define age of a particular rock layer

The principle that if rocks are undisturbed, older layers are under younger layers

The principle that Earth processes occurring today are similar to those that occurred in the past

Radiometric_____ is a method used to calculate the absolute age of a rock

A_____age is something's age in comparison to something else

Cavity in rock which an organism has decayed