Assertion: magnesium sulfate's magnesium | /r/AtLocation | earth
Facets:
value: in the crust
type: LOCATION
value: in the mantle
type: LOCATION
Source sentences:
text: On Earth, magnesium is found both in the crust and in the mantle; it's also the third-most abundant mineral dissolved in seawater, with a 0.13 percent concentration.