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In an undisturbed rock profile, the oldest rocks are found
Carbon-14
Uranium-238
Most life-forms that existed on Earth have become extinct.
The position of the layer compared to other layers
The processes in the rock cycle were the same in the past as they are today
comparing the amounts of decayed and undecayed radioactive isotopes in the rock
on the bottom
decay at a predictable rate
Which of these is the best indication of the relative age of a rock layer?
Carbon-14
Uranium-238
Most life-forms that existed on Earth have become extinct.
The position of the layer compared to other layers
The processes in the rock cycle were the same in the past as they are today
comparing the amounts of decayed and undecayed radioactive isotopes in the rock
on the bottom
decay at a predictable rate
Which statement can best be supported by the fossil record?
Carbon-14
Uranium-238
Most life-forms that existed on Earth have become extinct.
The position of the layer compared to other layers
The processes in the rock cycle were the same in the past as they are today
comparing the amounts of decayed and undecayed radioactive isotopes in the rock
on the bottom
decay at a predictable rate
Which radioactive isotope would be used to determine the age of a wooly mammoth found in Pleistocene sediments?
Carbon-14
Uranium-238
Most life-forms that existed on Earth have become extinct.
The position of the layer compared to other layers
The processes in the rock cycle were the same in the past as they are today
comparing the amounts of decayed and undecayed radioactive isotopes in the rock
on the bottom
decay at a predictable rate
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
Carbon-14
Uranium-238
Most life-forms that existed on Earth have become extinct.
The position of the layer compared to other layers
The processes in the rock cycle were the same in the past as they are today
comparing the amounts of decayed and undecayed radioactive isotopes in the rock
on the bottom
decay at a predictable rate
Which radioactive substance has the longest half-life?
Carbon-14
Uranium-238
Most life-forms that existed on Earth have become extinct.
The position of the layer compared to other layers
The processes in the rock cycle were the same in the past as they are today
comparing the amounts of decayed and undecayed radioactive isotopes in the rock
on the bottom
decay at a predictable rate
One similarity between Carbon-14 and Uranium 238 is that both
Carbon-14
Uranium-238
Most life-forms that existed on Earth have become extinct.
The position of the layer compared to other layers
The processes in the rock cycle were the same in the past as they are today
comparing the amounts of decayed and undecayed radioactive isotopes in the rock
on the bottom
decay at a predictable rate
Rock layers tell a story about their past. What is the basic assumption that is made when reading the story?
Carbon-14
Uranium-238
Most life-forms that existed on Earth have become extinct.
The position of the layer compared to other layers
The processes in the rock cycle were the same in the past as they are today
comparing the amounts of decayed and undecayed radioactive isotopes in the rock
on the bottom
decay at a predictable rate
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