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Why is the "Law of Superposition" critical to the study of fossil life forms?
comparing the amounts of decayed and undecayed radioactive isotopes in the rock
The processes in the rock cycle were the same in the past as they are today
It allows us to time-sequence fossils
11,400 years ago
on the bottom
Uranium-238
decay at a predictable rate
Most life-forms that existed on Earth have become extinct.
In an undisturbed rock profile, the oldest rocks are found
comparing the amounts of decayed and undecayed radioactive isotopes in the rock
The processes in the rock cycle were the same in the past as they are today
It allows us to time-sequence fossils
11,400 years ago
on the bottom
Uranium-238
decay at a predictable rate
Most life-forms that existed on Earth have become extinct.
Rock layers tell a story about their past. What is the basic assumption that is made when reading the story?
comparing the amounts of decayed and undecayed radioactive isotopes in the rock
The processes in the rock cycle were the same in the past as they are today
It allows us to time-sequence fossils
11,400 years ago
on the bottom
Uranium-238
decay at a predictable rate
Most life-forms that existed on Earth have become extinct.
The absolute age of a rock is the approximate number of years ago that the rock formed. The absolute age of an igneous rock can best be determined by
comparing the amounts of decayed and undecayed radioactive isotopes in the rock
The processes in the rock cycle were the same in the past as they are today
It allows us to time-sequence fossils
11,400 years ago
on the bottom
Uranium-238
decay at a predictable rate
Most life-forms that existed on Earth have become extinct.
One similarity between Carbon-14 and Uranium 238 is that both
comparing the amounts of decayed and undecayed radioactive isotopes in the rock
The processes in the rock cycle were the same in the past as they are today
It allows us to time-sequence fossils
11,400 years ago
on the bottom
Uranium-238
decay at a predictable rate
Most life-forms that existed on Earth have become extinct.
Which radioactive substance has the longest half-life?
comparing the amounts of decayed and undecayed radioactive isotopes in the rock
The processes in the rock cycle were the same in the past as they are today
It allows us to time-sequence fossils
11,400 years ago
on the bottom
Uranium-238
decay at a predictable rate
Most life-forms that existed on Earth have become extinct.
Which statement can best be supported by the fossil record?
comparing the amounts of decayed and undecayed radioactive isotopes in the rock
The processes in the rock cycle were the same in the past as they are today
It allows us to time-sequence fossils
11,400 years ago
on the bottom
Uranium-238
decay at a predictable rate
Most life-forms that existed on Earth have become extinct.
A fossil shell contain 25% of the original amount of its carbon-14. Approximately how many years ago was this shell part of a living organism?
comparing the amounts of decayed and undecayed radioactive isotopes in the rock
The processes in the rock cycle were the same in the past as they are today
It allows us to time-sequence fossils
11,400 years ago
on the bottom
Uranium-238
decay at a predictable rate
Most life-forms that existed on Earth have become extinct.
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