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16 Cards in this Set
- Front
- Back
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Fossil
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objects that are traces or remains of living things from long ago
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Original Remains
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Fossils that are actual bodies or body parts of organisms
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Mold
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A visible shape that was left after an animal or plant was buried in sediment and then decayed away.
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Cast
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A solid model in the shape of an organism.
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Carbon Films
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Carbon that dead plants and animals leave behind. Can show details of soft parts.
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Trace Fossils
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Evidence that that organism was there. Includes preserved footprints and animal holes.
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Petrified Wood
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Stone fossil of a tree
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Ice Core
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A tubular sample that shows the layers of snow and ice that have built up over thousands of years.
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Relative Age
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The age of an event or object in relation to other events or objects.
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Superposition
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The idea that the younger rocks are at the top and older are at the bottom
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Index Fossil
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Fossils of organisms that were common, lived in many areas, and existed only during a certain time span
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Absolute Age
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The actual age in years of an event or object.
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Half-Life
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THe legnth of time it takes for half of the atoms in a sample of a radioactive element to change from an unstable form to another form.
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Uniformitaranism
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THe Idea that earth is an always-changing place and that the same forces of change at work today were also at work in the past.
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Geological Time Scale
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Earth's history divided into intervals defined by major e vents or changes on Earth.
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Period
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A length or portion of time.
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