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ch 4

views of earths past

TermDefinition
original remains actual bodies or body parts of organisms
ice core tubular sample sample that shows the layers of snow and ice that have built up over thousands of years
relative age the age of an event or object in relation to other events or oblects
index fossil fossils of organisms that were common, that lived in many areas, and that existed only during specific spans of time
absolute age the actual age of an event or object
half-life the time it takes for half an atom in a sample of a radioactive element to change from an unstableform into another form
uniformitarianism the idea that earth is always-changing place
geological time scale divides earth's history into intervals of time defined by major events or changes on earth
fossils traces or remains of living things from long ago
Created by: harley2222
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