Assertion: calcium oxide | /r/CreatedBy | seashell
Facets:
value: usually
type: DEGREE
Source sentences:
text: Calcium oxide is usually made by the thermal decomposition of materials, such as limestone or seashells, that contain calcium carbonate (CaCO 3 ; mineral calcite) in a lime kiln.
text: Calcium oxide is typically made by the thermal decomposition of materials, such as seashells or limestone, that have calcium carbonate (CaCO 3 ; inorganic calcite) in a lime kiln.