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