Assertion: protactinium | /r/AtLocation | rock
Facets:
value: in very low concentrations
type: LOCATION
value: naturally
type: MANNER
Source sentences:
text: Protactinium is naturally present in soil, rock, surface water, groundwater, plants and animals in very low concentrations (on the order of 1 ppt or 0.1 picocouries (pCi)/g).
text: Protactinium is naturally present in soil, rock, surface water, groundwater, plants and animals in very low concentrations (on the order of 1 ppt or 0.1 picocouries (pCi)/g).