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What is a half-life?
The oldest
The length of time needed for half of the atoms of a sample of a radioactive isotope to decay.
They are completely intact with organs, muscles, and even skin.
All of the above.
All of the above
Gases escape from sediment, leaving carbon behind. Eventually only a thin film of carbon remains.
It was the Age of Mammals
absolute age of rocks
Why do scientists study rocks and fossils?
The oldest
The length of time needed for half of the atoms of a sample of a radioactive isotope to decay.
They are completely intact with organs, muscles, and even skin.
All of the above.
All of the above
Gases escape from sediment, leaving carbon behind. Eventually only a thin film of carbon remains.
It was the Age of Mammals
absolute age of rocks
The bottom layer in an undisturbed sedimentary bed is usually
The oldest
The length of time needed for half of the atoms of a sample of a radioactive isotope to decay.
They are completely intact with organs, muscles, and even skin.
All of the above.
All of the above
Gases escape from sediment, leaving carbon behind. Eventually only a thin film of carbon remains.
It was the Age of Mammals
absolute age of rocks
How does carbon film form?
The oldest
The length of time needed for half of the atoms of a sample of a radioactive isotope to decay.
They are completely intact with organs, muscles, and even skin.
All of the above.
All of the above
Gases escape from sediment, leaving carbon behind. Eventually only a thin film of carbon remains.
It was the Age of Mammals
absolute age of rocks
Why is the Cenozoic era important?
The oldest
The length of time needed for half of the atoms of a sample of a radioactive isotope to decay.
They are completely intact with organs, muscles, and even skin.
All of the above.
All of the above
Gases escape from sediment, leaving carbon behind. Eventually only a thin film of carbon remains.
It was the Age of Mammals
absolute age of rocks
What happened during the Precambrian time?
The oldest
The length of time needed for half of the atoms of a sample of a radioactive isotope to decay.
They are completely intact with organs, muscles, and even skin.
All of the above.
All of the above
Gases escape from sediment, leaving carbon behind. Eventually only a thin film of carbon remains.
It was the Age of Mammals
absolute age of rocks
What is unique about animals that are preserved in ice?
The oldest
The length of time needed for half of the atoms of a sample of a radioactive isotope to decay.
They are completely intact with organs, muscles, and even skin.
All of the above.
All of the above
Gases escape from sediment, leaving carbon behind. Eventually only a thin film of carbon remains.
It was the Age of Mammals
absolute age of rocks
Geologists use radioactive dating to find the
The oldest
The length of time needed for half of the atoms of a sample of a radioactive isotope to decay.
They are completely intact with organs, muscles, and even skin.
All of the above.
All of the above
Gases escape from sediment, leaving carbon behind. Eventually only a thin film of carbon remains.
It was the Age of Mammals
absolute age of rocks
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