Assertion: inorganic arsenic | /r/AtLocation | the earth's crust
Facets:
value: naturally
type: MANNER
Source sentences:
text: In Alaska, most arsenic in groundwater is likely derived from inorganic arsenic that occurs naturally in the Earth's crust, most commonly as the mineral arsenopyrite.
text: Inorganic arsenic naturally occurs in the earth's crust and soil in a wide range of concentrations.