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10 June, 09:48

Why is helium trapped in the earth's crust? If it's its trapped in the earth's crust how does it get into the air that we breathe?

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  1. 10 June, 10:15
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    A small proportion of helium in the crust is helium that was trapped in the Earth when the Earth formed and has not yet escaped. Most helium on Earth, however, forms as a result of alpha decay of uranium and thorium. The emitted alpha particles, once they grab a couple of stray electrons, become helium atoms and can accumulate in gas reservoirs along with things such as methane.
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