are the remains, imprints, oe traces of prehistoric organism.
2.Permineralized remains:
are fossils in which thespaces inside are filled with minerals from groundwater.
are fossils in which thespaces inside are filled with minerals from groundwater.
is a thin film of carbon,residue is left, forming a silhouette of the original organism.
is the hard part might decay or dissolve, leaving behind a cavity in the rock.
5. Cast:
is the mineral-rich water or other sediment might enter the cavity.
is the mineral-rich water or other sediment might enter the cavity.
6. Index Fossils:
are the remains of species that existed on Earth for relatively short periods of time, were abundant, and were widespread geographically.
are the remains of species that existed on Earth for relatively short periods of time, were abundant, and were widespread geographically.
7. Principle of Superposition:
undisturbed layers of rocks.
undisturbed layers of rocks.
8. Relative Age:
is its age in comparison to other things.
is its age in comparison to other things.
9. unconformities:
are gaps in rock sequences.
are gaps in rock sequences.
10. Absolute Age:
is the age, in years, of a rock or other object.
is the age, in years, of a rock or other object.
11. Radioactive Decay:
is the process of breaking down.
is the process of breaking down.
12. Half-Life:
is the time it takes for half of thecarbon -14 is 5,730 years.
is the time it takes for half of thecarbon -14 is 5,730 years.
13. Radiometric Dating:
is the process of the absolute age of rock.
is the process of the absolute age of rock.
14.Uniformitarianism:
Is a principle is often paraphrased.
Is a principle is often paraphrased.
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