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Changing Earth Unit

TermDefinition
Mold Fossil A type of fossil formed due to chemical reactions leaving a cavity where the original fossil used to be.
Cast Fossil A mold fossil that has filled with minerals.
Carbon Film The imprint of a fossil on rock leaving a carbon residue
Trace Fossils The fossil of an animal track or burrow
Preserved Remains A fossil found in tar, amber, or ice that prevents the organism from decaying.
Catastrophism idea that conditions and organisms on Earth change in quick, violent event.
Uniformitarianism states that geologic processes that occur today are similar to those that have occurred in the past.
Stratigraphy the branch of geology that studies the order and relative age of rock/soil layers on Earth.
Law of Superposition states that the youngest layers of Earth are located on the surface and as you do deeper into the Earth, the layers get older.
Relative age is a way of describing how old something is not by using numbers but by using a comparison.
Index fossil fossil of an organism that was alive for only a short period of time, were abundant and widespread geographically ; scientists can use these to assign dates to rock layers.
Absolute age the numerical age in years of an object
Radiometric dating process to determine absolute age of an object isotopes break down into other isotopes and particles.
half life time it takes for half the atoms of an isotope to decay.
The three things needed for fossilization plentiful sediment, quick burial, hard parts
The age at which radiometric dating becomes unreliable 50,000
It can show us what the past composition of the atmosphere on earth was like Ice cores
Created by: 21fparsons
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