Are the remains, imprints, or traces of prehistoric organisms.
Permineralized Remains
Are fossils in which spaces inside are filled with minerals from groundwater.
Carbon Film
Is when a thin film of carbon residue is left, forming a silhouette of the original organism.
Mold
Is when the hard part decay or dissolve, leaving behind a cavity in the rock.
Cast
Is when mineral- rich water or other sediment enter the cavity, forming a new rock, and produces a copy of the original object.
Index Fossils
Are the remains of species that existed on Earth for relatively short periods of time, they were abundant and widespread geographically.
Principle of Superposition
It saids the in undistributed layers of rock, the oldest rocks are on the bottom and the rocks become progressively younger toward the top.
Relative Age
Is the age of something in comparison to other things.
Unconformities
Are gaps in rock sequence.
Absolute Age
Is the age, in years, of a rock or other object.
Radioactive Decay
The process of braking down.
Half-life
Is the time it takes for half of the atoms in the isotope to decay.
Radiometric Dating
Is the process of knowing the half-life of the parent to measure the absolute age of a rock.
Uniformitarianism
A principle that states that Earth processes occurring today are similar to those that occurred in the past.
