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physical science

Geological Time Spiral

Evidence of our planet’s antiquity is revealed by the once-molten rocks that form the Earth’s crust. These rocks contain radioactive elements whose isotopes decay at known rates. Study of geo-strata, paleontology and atomic dating of certain rocks is a reliable method for determining the age of the Earth. According to the US Geological Survey publication 2008-58, Earth is 4.5 billion years of age.