> The earth's crust is 13% aluminium by weight I found this astonishing, and looked for sources. It looks like they[1][2] say it's more like 8.2% aluminum by

> The earth's crust is 13% aluminium by weight I found this astonishing, and looked for sources. It looks like they[1][2] say it's more like 8.2% aluminum by weight. That's still quite high, though, and also it's the third highest behind oxygen and silicon. (If you exclude oxygen, I think it goes up to 15.4% aluminum.) Very interesting. [1] http://education.jlab.org/itselemental/ele013.html http://education.jlab.org/itselemental/ele013.html [2] https://en.wikipedia.org/wiki/Abundance_of_elements_in_Earth%27s_crust https://en.wikipedia.org/wiki/Abundance_of_elements_in_Earth...