Assertion: oil spill | /r/HasAspect | little visible effect
Facets:
value: at the same time
type: TEMPORAL
Source sentences:
text: At the same time, an oil spill involving small but continuous releases such as those from leaking pipelines or road runoffs may have little visible effect (they are naturally attenuated usually due to microbial degradation as well as due to many chemical-physical processes).