What process caused the material that formed the Earth to gather long ago?

What did the mass extinction at the end of the Permian Period lead to?

According to the impact hypothesis, dinosaurs became extinct when

The repeated advance and retreat of ice sheets characterized which Epoch?

Where are the oldest rocks located on a geologic column.

The formation of an oxygen atmosphere began during which Era?

The age of an object in relation to the ages of other objects is known as its

Index fossils found in rock layers in different areas of the world indicate that the rock layers

This isotope is used to date objects less than 70,000 years old.

How is radioactive decay used to determine the absolute age of rocks?

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