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What are the two methods used together to demonstrate the Earth is at least 3.8 billion years old? List and briefly describe the methods.

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Answer:

The three primary methods are Radiation Measurement.

Explanation:

Radiation Measurement and the Fossil Record are the two methods used to show the age of Earth.

How earth's age can be calculated?

Radiation Measurement and the Fossil Record are the two methods which are used together to demonstrate the Earth is at least 3.8 billion years old because these two methods provides evidence for the presence of life on earth.

So we can conclude that Radiation Measurement and the Fossil Record are the two methods used to show the age of Earth.

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