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Match the following:
-Wave visible on the electrocardiogram (ECG) representing atrial depolarization
Isotopic Ages
Measures the time elapsed since a particular mineral or rock formed, based on the decay rates of radioactive isotopes.
Billion Years
A period of time equal to 1,000 million years, often used in geological and astronomical contexts to describe the age of Earth or the universe.
Mineral Grains
individual particles or crystals within a rock, defining its texture and often determining its properties and classification.
Cenozoic
The current geological era, beginning 66 million years ago, marked by significant development of mammals.
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