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chapter 10

Vocab Words

TermDefinition
Fossil Preserved remains or evidence of ancient living things
Catastrophism Idea that conditions and organism on earth change in quick, violent events
Uniformitarianism Stages that geologic processes that occur today are similar to those that have occured in the past
Carbon Film The fossilized carbon outline of an organism or part of an organism
Mold The impression in a rock left by an ancient organism
Cast Fossil copy of an organism made when a mold of the organism is filled with sediment or mineral deposit
Trace Fossil Pressed evidence of the activity of an organism
Paleontologist Scientist who study fossil
Relative Age The age of rocks and geologic features compared with other rocks
Superposition The principle that in undisturbed rock layers, the oldest rocks are on the bottom
Inclusion Piece of an older rock that becomes part of a new rock
Unconformity A surface where rock has eroded away, producing a break, or gap, in the rock record
Correlation Matching rocks and fossils from separate locations
Index fossil Species that existed on earth for a short lenght of time, were abundant, and inhabited many locations
Absolute Age Numerical age in years of a rock or object
Isotope Atoms of the same element that have different numbers of neurons
Radioactive Decay Process by which an unstable atomic nucleus loses energy by radiation
Half-Life Time required for half of the parent isotopes to decay into daughter isotopes
Created by: pinkteddybear444
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