Assertion: uranium | /r/AtLocation | mineral
Facets:
value: naturally
type: MANNER
value: at lower levels
type: LOCATION
Source sentences:
text: 7.1 Natural exposure is a relevant comparison Uranium is naturally present in minerals and soil and, at lower levels, is found in food and drink.
text: It occurs in many minerals and is used chiefly as a source of nuclear energy by fission of the radioisotope uranium – 235.
text: Uranium is the second most common actinide metal and is found in many minerals.