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How is radioactive decay used to determine the absolute age of rocks?
Pleistocene
abundant new life-forms in the Mesozoic and Cenozoic Era
Original radioactive material remaining in the sample is compared to non-radioactive material formed
formed during the same period of time.
gravitational contraction
the bottom
a giant meteorite crashed into Earth
Carbon-14
This isotope is used to date objects less than 70,000 years old.
Pleistocene
abundant new life-forms in the Mesozoic and Cenozoic Era
Original radioactive material remaining in the sample is compared to non-radioactive material formed
formed during the same period of time.
gravitational contraction
the bottom
a giant meteorite crashed into Earth
Carbon-14
What process caused the material that formed the Earth to gather long ago?
Pleistocene
abundant new life-forms in the Mesozoic and Cenozoic Era
Original radioactive material remaining in the sample is compared to non-radioactive material formed
formed during the same period of time.
gravitational contraction
the bottom
a giant meteorite crashed into Earth
Carbon-14
The repeated advance and retreat of ice sheets characterized which Epoch?
Pleistocene
abundant new life-forms in the Mesozoic and Cenozoic Era
Original radioactive material remaining in the sample is compared to non-radioactive material formed
formed during the same period of time.
gravitational contraction
the bottom
a giant meteorite crashed into Earth
Carbon-14
What did the mass extinction at the end of the Permian Period lead to?
Pleistocene
abundant new life-forms in the Mesozoic and Cenozoic Era
Original radioactive material remaining in the sample is compared to non-radioactive material formed
formed during the same period of time.
gravitational contraction
the bottom
a giant meteorite crashed into Earth
Carbon-14
Index fossils found in rock layers in different areas of the world indicate that the rock layers
Pleistocene
abundant new life-forms in the Mesozoic and Cenozoic Era
Original radioactive material remaining in the sample is compared to non-radioactive material formed
formed during the same period of time.
gravitational contraction
the bottom
a giant meteorite crashed into Earth
Carbon-14
According to the impact hypothesis, dinosaurs became extinct when
Pleistocene
abundant new life-forms in the Mesozoic and Cenozoic Era
Original radioactive material remaining in the sample is compared to non-radioactive material formed
formed during the same period of time.
gravitational contraction
the bottom
a giant meteorite crashed into Earth
Carbon-14
Where are the oldest rocks located on a geologic column.
Pleistocene
abundant new life-forms in the Mesozoic and Cenozoic Era
Original radioactive material remaining in the sample is compared to non-radioactive material formed
formed during the same period of time.
gravitational contraction
the bottom
a giant meteorite crashed into Earth
Carbon-14
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