How is the geologic time scale related to the fossil record?
  • The periods of the time scale were constructed based on ranges of fossil organisms.
  • Geologic features that cut through rocks must form after the rocks that they cut through.
  • the amount of time over which the number of parent isotopes decreases by half
  • Sedimentary rocks are close to horizontal when deposited.
What is the Principle of Cross-Cutting Relationships?
  • Sedimentary rocks are close to horizontal when deposited.
  • Geologic features that cut through rocks must form after the rocks that they cut through.
  • Within a sequence of rock layers formed at Earth's surface, rock layers lower in the sequence are older.
  • the amount of time over which the number of parent isotopes decreases by half
Which principle or law of geology states that in a sequence of undeformed sedimentary rocks, each bed is older than the one above?
  • the Principle of Cross-Cutting Relationships
  • superposition
  • nonconformity
  • Parent isotopes turn into daughter isotopes.
If a rock contains ten different kinds of fossils, which of the following must be true?
  • Relative age dating places rocks and events in chronological order, but does not provide information about absolute age.
  • organisms with overlapping ranges and geologically short lifespans
  • All of the organisms had to be alive when the rock was deposited.
  • Paleozoic, Mesozoic, Cenozoic
Which is the shortest interval of geologic time?
  • the amount of time over which the number of parent isotopes decreases by half
  • Phanerozoic
  • epoch
  • Sedimentary rocks are close to horizontal when deposited.
What is the best definition of fossil range?
  • Parent isotopes turn into daughter isotopes.
  • The period of time when an organism first and last appears in the sedimentary record.
  • law of superposition: in most sedimentary sequences, the oldest rocks will be on the bottom
  • superposition
Which eon translates to "visible life" from the Greek?
  • epoch
  • nonconformity
  • Paleozoic, Mesozoic, Cenozoic
  • Phanerozoic
Which principle of relative age dating is important for determining the relative age of igneous rock that has intruded into overlying rock?
  • the Principle of Cross-Cutting Relationships
  • organisms with overlapping ranges and geologically short lifespans
  • The rate of decay of atoms in container A is greater than the rate of decay of atoms in container B.
  • Paleozoic, Mesozoic, Cenozoic
Which of the following characteristics is the most desirable for constraining the relative age of rocks?
  • Relative age dating places rocks and events in chronological order, but does not provide information about absolute age.
  • the amount of time over which the number of parent isotopes decreases by half
  • organisms with overlapping ranges and geologically short lifespans
  • The periods of the time scale were constructed based on ranges of fossil organisms.
What happens during radioactive decay?
  • Parent isotopes turn into daughter isotopes.
  • superposition
  • Sedimentary rocks are close to horizontal when deposited.
  • the amount of time over which the number of parent isotopes decreases by half
What is the scientific definition of half-life?
  • Sedimentary rocks are close to horizontal when deposited.
  • Geologic features that cut through rocks must form after the rocks that they cut through.
  • The periods of the time scale were constructed based on ranges of fossil organisms.
  • the amount of time over which the number of parent isotopes decreases by half
What is the Principle of Superposition?
  • Sedimentary rocks are close to horizontal when deposited.
  • the amount of time over which the number of parent isotopes decreases by half
  • Within a sequence of rock layers formed at Earth's surface, rock layers lower in the sequence are older.
  • Geologic features that cut through rocks must form after the rocks that they cut through.
What "law" of relative dating did you apply to determine the relative ages of the rocks here?
  • Geologic features that cut through rocks must form after the rocks that they cut through.
  • law of superposition: in most sedimentary sequences, the oldest rocks will be on the bottom
  • All of the organisms had to be alive when the rock was deposited.
  • Relative age dating places rocks and events in chronological order, but does not provide information about absolute age.
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