The helium that is present on Earth is not a primordial component but has been generated by radioactive decay.
Alpha particles, ejected from the nuclei of heavier radioactive substances, are nuclei of the isotope helium-4.
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Finally in 1976, it was discovered that the earth is "really" 4.6 billion years old… The answer of 25 million years deduced by Kelvin was not received favorably by geologists.