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A comment on The Scariest, Most Boring Armageddon. Parent comment

Re:The Scariest, Most Boring Armageddon by maxander on Sunday January 31, 2016 @12:57PM (#11007191)
Define "average rock," and cite a source for this factoid, please? I'd never heard anything of the sort.

...While you're at it, define "incredibly easy." I'd gathered that thorium fission was still a hard problem.

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Re:The Scariest, Most Boring Armageddon by beefman on Sunday January 31, 2016 @05:27PM (#11008428)
Average crustal abundance 10ppm * 2.6g/cm^3 * 1m^3 = 26g

26g * 8e16 J/t ≈ 2.6t * 1200ΔC * 0.79J/gΔC * 1000

How did you gather that?

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