Chapter 12.1 study guide biology for quiz – Flashcards
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An organism trapped in tree resin that hardens after being buried.
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Amber preserved fossils
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An impression is left in sediment, and minerals fill the impression in, recreating the original shape of the organism.
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Natural Cast.
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Fossils that record the activity of an organism. Examples include nests, burrows, imprints of leaves, and footprints.
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Trace fossil.
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Fossils that occur when minerals carried by water are deposited around a hard structure, sometimes replacing the hard structure itself overtime.
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Permineralized fossil
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Organism becomes incased in materials such as ice or volcanic ash, or immersed in a bog.
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Preserved remains.
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What is the main purpose of both relative dating and radiometric dating?
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to determine how old a fossil is.
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What is the main difference between relative dating and radiometric dating?
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Relative dating is based on other items found near the fossil, while radiometric dating is based on the fossil itself.
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What sort of time soon can be measured using radiometric dating techniques?
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A geologic time span such as hundreds of thousands of years.
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Measures the actual age of a fossil?
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Radiometric dating.
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Most elements have several of these....
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Isotopes.
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Measure of the release of radiation....
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Relative dating.
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Infers order in which groups of organisms existed....
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Half-life.
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What is the most common type of fossilization?
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Permineralization
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What kind of fossil is formed when the original tissues of a trilobite are washed away, leaving an impression that becomes filled with minerals?
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Natural Cast.
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Do relative dating methods show the exact age of the fossil?
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No, they only compare the order in which groups of organisms existed.
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An isotope of carbon, C-14, has a half life of 5700 years. How much C-14 will be left in an organism's remains 11,400 years after the organism died?
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25%
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Why can't C-14 be used to determine the age of rocks?
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The half life of C-14 is to short.
