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How does earth have helium in the first place?
I've always wondered how the earth has helium trapped, considering soil and rock is porous, and even Mylar has difficulty trapping helium. How would it have been trapped in the first place, considering denser elements should have coalesced in the center of the earth, while the lighter ones form the atmosphere? Seems improbable considering the earth is constantly churning with convergent and divergent plate movement, along with volcanic activity.
Shouldn't there be a massive ball of gold, uranium, or perhaps osmium at the core of the earth?
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