Chapter 6 Science Voc Words

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martha.hulsey
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87711
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Chapter 6 Science Voc Words
Updated:
2011-05-25 13:01:52
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Chapter Science Voc Words
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Chapter 6 Science Voc Words
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  1. a principle that states that geologic processes that occurred in the past can be explained by current geologic processes
    uniformitarianism
  2. a principle that states that geologic change occurs suddenly
    catastrophism
  3. the scientific study of past life, such as fossils
    paleontology
  4. any method of determining whether an event or object is older or younger than other events or objects
    relative dating
  5. a principle that states that younger rocks lie above older rocks if the layers have not been disturbed
    superposition
  6. an arrangement of rock layers in which the oldest rocks are at the bottom
    geologic column
  7. a break in the geologic record created when rock layers are eroded or when sediment is not deposited for a long period of time
    unconformity
  8. any method of measuring the age of an event or object in years
    absolute dating
  9. an atom that has the same number of protons (or the same atomic number) as other atoms of the same element do but that has a different number of neutrons (and thus a different atomic mass)
    isotope
  10. the process in which a radioactive isotope tends to break down into a stable isotope of the same element or another element
    radioactive decay
  11. a method of determining the age of an object by estimating the relative percentages of a radioactive (parent) isotope and a stable (daughter) isotope
    radiometric dating
  12. the time needed for half of a sample of a radioactive substance to undergo radioactive decay
    half-life
  13. the remains or physical evidence of an organism preserved by geological processes
    fossil
  14. a fossilized mark that is formed in soft sediment by the movement of an animal
    trace fossil
  15. a mark or cavity made in a sedimentary surface by a shell or other body
    mold
  16. a type of fossil that forms when sediments fill in the cavity left by a decomposed organism
    cast
  17. a fossil that is found in the rock layers of only one geologic age and that is used to establish the age of the rock layers
    index fossil
  18. the standard method used to divide the Earth's long natural history into manageable parts
    geologic time scale
  19. the largest division of geologic time
    eon
  20. a unit of geologic time that includes two or more periods
    era
  21. a unit of geologic time into which eras are divided
    period
  22. a subdivision of a geologic period
    epoch
  23. the death of every member of a species
    extinction

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