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Voc.2 Earth Changes

Science FlashCards

Fossils An object that is a trace or remains of living things from the past.
original remains Fossils that are the actual bodies or body parts of an organism (ex. Bones)
ice core a sample of earth that is taken in a tube and shows the layers that have built up over thousands of years
relative age (dating) the age of an even or object in relation to other events or objects (younger or older)
absolute age (dating) the actual age in years of an object or event
index fossil Fossils of organisms that were common, lived in many areas, and existed only during a certain time span
half-life the length of time it takes for half of the atoms of a radioactive element to change to another form
uniformitarianism the theory that Earth is an always-changing place and that the same forces of change from the past are at work today.
Geological Time Scale the scale that divides Earth’s history into intervals that are defined by major events or changes on Earth