Chapter 16 8th grade

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Terms in this set (...)

Fossils
The preserved remains or traces of organisms that once lived on Earth.
Catastrophism
is the idea that conditions and organisms on Earth change in quick, violent events
Uniformitarianism
States that geologic processes that occur today are similar to those that have occurred in the past
Carbon Film
is the fossilized carbon outline of an organism or part of an organism
Mold
is the impression in a rock left by an ancient organism
Cast
is a fossil copy of an organism in a rock
Trace fossil
is the preserved evidence of the activity of an organism
Palentologist
A scientist who studies fossils
relative dating
Method of determining the age of a fossil by comparing its placement with that of fossils in other layers of rock
Superposition
the principle that in undisturbed rock layers, the oldest rocks are on the bottom
Inclusion
a piece of an older rock that becomes part of a new rock
Unconformity
is 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
a fossil known to have lived in a particular geologic age that can be used to date the rock layer in which it is found
Absolute age
to mean the numerical age, in years, of a rock or object
Isotope
Atoms of the same element that have different numbers of neutrons
Radioactive decay
is the process by which the nucleus of an unstable atom loses energy by emitting radiation
Half time
the time required for half of the parent isotops to decay into daughter isotops
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