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Unlike uranium, thorium doesn't dissolve well in water, so it precipitates out on particles in the water column.

Weathering may have ultimately concentrated heat-producing elements like uranium, thorium and potassium in the shallow crust, allowing the deeper crust to cool and harden.

Heavy elements may result from this "nucleosynthesis"; in fact, half of the heavy isotopes up to bismuth and all of thorium and uranium in the universe may have been created by the r process.

It forms through the radioactive decay of uranium and thorium deep in the crust and eventually seeps out and escapes into space.

Other elements such as iodine and thorium, which are needed to sustain life on earth, are also likely to be amongst the material ejected by the explosion, also known as a kilonova.