The age of a rock given as the number of years since the rock formed.

The age of a rock compared to the ages of rock layers. (approximately)

The time it takes for half of the atoms in a radioactive element to decay

Older rocks lie below the youngest rocks.

The breakdown of a radioactive isotope, releasing particles and energy.

A gap in the geologic column...

The Law of Superposition states...

Carbon-14 is an example of ...

Index fossil have 2 requirements...

The Geologic Time Scale

Air bubbles trapped inside ice cores help scientists determine...

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