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30 Cards in this Set

  • Front
  • Back
absolute dating
provides a more exact age of rocks
radioactive isotope
element with different #'s of neutrons that tend to decay
parent isotope
original isotopes
daughter isotopes
isotope the parent decayinto stable
ex. of parent isotope
u-235
ex. of daughter isotope
u-235 becomes pb-207 after decay
half-life
the time it takes half of parent isotope to decayinto daughter isotope
radioactive decay
uses half life to determine the age
radiometric dating
same as radioactive decay
fission-trace dating
protons and neutrons leaving a parent isotope leave "tracks"
accelerator mass spectrometry
uses c-14 isotope to find age of very small, organic ("carbon-based") sample
relative dating
estimate of age based on location and other observations
principle of superposition
if rocks have not move
prin. of uniformitarianism
everthing that hapends today has occured on earth in the same way in the past
prin. of cross-cutting
has intrusion, inclusion , and correlation
absolute dating
provides a more exact age of rocks
radioactive isotope
element with different #'s of neutrons that tend to decay
parent isotope
original isotopes
daughter isotopes
isotope the parent decayinto stable
ex. of parent isotope
u-235
ex. of daughter isotope
u-235 becomes pb-207 after decay
half-life
the time it takes half of parent isotope to decayinto daughter isotope
radioactive decay
uses half life to determine the age
radiometric dating
same as radioactive decay
fission-trace dating
protons and neutrons leaving a parent isotope leave "tracks"
accelerator mass spectrometry
uses c-14 isotope to find age of very small, organic ("carbon-based") sample
relative dating
estimate of age based on location and other observations
principle of superposition
if rocks have not move
prin. of uniformitarianism
everthing that hapends today has occured on earth in the same way in the past
prin. of cross-cutting
has intrusion, inclusion , and correlation