Assertion: cadmium | /r/AtLocation | sedimentary rocks
Facets:
value: at higher levels
type: LOCATION
value: than in igneous or metamorphic rocks
type: OTHER
Source sentences:
text: It is also found in sedimentary rocks at higher levels than in igneous or metamorphic rocks, with the exception of course of the nonferrous metallic ores of zinc, lead and copper.