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Earth Sciences 7 Online
OpenStudy (anonymous):

Scientists study many lines of evidence to estimate the age of the Earth, including rocks, fossils, other objects in the solar system, and the half-lives of radioactive elements. Based on all of this information, scientists estimate the age of the Earth to be _______ years.

OpenStudy (anonymous):

please help me

OpenStudy (anonymous):

its at least 9,000 years old

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