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    $\begingroup$ They way of the magma in the volcanos are probably not linear, so it won't sink until the core of the Earth, but probably even this will be enough. $\endgroup$
    – peterh
    Commented May 31, 2018 at 20:30
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    $\begingroup$ Can you please remove the line about the Earth's core because that's complete rubbish. There's a whole 2800 km of solid mantle for it to get through before it reaches the core, even aside from the fact that it would melt in many magmas, especially if it sinks a bit first. $\endgroup$
    – bon
    Commented May 31, 2018 at 20:41
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    $\begingroup$ No the mantle really is very solid on short timescales. It has a viscosity of $\mathrm{\sim 10^{20} - 10^{21} ~Pa~s}$. Also, it won't even reach the mantle if you dump it in a volcano. It might get a hundred metres down if you're very lucky before it melts. $\endgroup$
    – bon
    Commented May 31, 2018 at 20:59
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    $\begingroup$ "Next to the nuclear reactor, the only other chance is to dump it into a volcano. " Are there any volcanoes next to a nuclear reactor? That seems quite unsafe. $\endgroup$
    – Acccumulation
    Commented May 31, 2018 at 22:39
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    $\begingroup$ With full understanding of the intended meaning...pretty sure some of the nuclear reactors in japan are physically quite close to volcanoes :P $\endgroup$
    – Ruadhan2300
    Commented Jun 1, 2018 at 12:40