Assertion: corrosion | /r/HasProperty | occur
Facets:
value: naturally
type: MANNER
Source sentences:
text: Corrosion is more pronounced at acid numbers above 2.0, and acid numbers as high as 6 or 7 or more can occur.
text: Corrosion is a naturally occurring phenomenon commonly defined as the deterioration of a material (usually a metal) that results from a chemical or electrochemical reaction with its environment.1