Assertion: silicon | /r/HasProperty | combined with oxygen
Facets:
value: often
type: TEMPORAL
Source sentences:
text: Silicon combined with oxygen becomes silica, the quintessential glass-making oxide.
text: Silicon is also a relative abundant element on Earth, though in nature silicon is often combined with other molecules such as oxygen (i.e. silica or sand)
text: Silicon on Earth is usually found combined with oxygen, and removing the oxygen is difficult.
text: Silicon appears more commonly in the form of a compound such as silica (SiO2), where it is combined with oxygen, that usually takes the form of sand.