Assertion: cadmium | /r/HasProperty | occurring element
Facets:
value: naturally
type: MANNER
value: in earth's crust
type: LOCATION
Source sentences:
text: Cadmium, a naturally occurring element found in the earth’s crust, was discovered in 1817, but was not used commercially until the end of the 19th century.
text: Cadmium levels in the environment increased rapidly in the period from 1800 to 1960, due predominantly to industrialization in the Western World and the huge increase in fossil fuel combustion during that period and since cadmium is a naturally occurring impurity found in all fossil fuels.
text: Most cadmium is obtained as a byproduct of the chemical treatment of copper, lead, and zinc ores, although it is a naturally occurring element in Earth's crust.