Assertion: spill's impact | /r/HasProperty | severe
Facets:
value: relatively
type: DEGREE
value: often
type: DEGREE
Source sentences:
text: If the impact is severe, the top layer of sand containing the tar balls may be removed and replaced with clean sand.
text: Impacts are often relatively severe, caused primarily by the physical properties of the oil; although in some cases, particularly with lighter oils, chemical toxicity may be a significant problem.