He is a primordial substance in the Earth's , thought to have been trapped during the planet's initial formation. The ratio of He to He within the Earth's crust and mantle is less than that in the solar disk (as estimated using meteorite and lunar samples), with terrestrial materials generally containing lower He/ He ratios due to production of He from radioactive decay. He has a cosmological ratio of 300 atoms per million atoms of He, leading to the assumption that the o. He is a primordial substance in the Earth's , thought to have been trapped during the planet's initial formation. The ratio of He to He within the Earth's crust and mantle is less than that in the solar disk (as estimated using meteorite and lunar samples), with terrestrial materials generally containing lower He/ He ratios due to production of He from radioactive decay. He has a cosmological ratio of 300 atoms per million atoms of He, leading to the assumption that the o.
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