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Health Sciences 22 Online
OpenStudy (cicilybailey14):

Geologists believe the Earth to be this old 4.6 trillion years old 4.6 million years old 46 million years old 4.6 billion years old

OpenStudy (anonymous):

4.6 billion as it is said here-"By using the radiometric dating system on these meteorites, geologists have been able to determine that the Earth is 4.54 billion years old within a margin of error of about 1%"

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