Assertion: body abrasion | /r/CreatedBy | hard protuberances
Facets:
value: on the counterface or hard particles
type: LOCATION
Source sentences:
text: Two-body abrasion is caused by hard protuberances on the counterface or hard particles attached to it, while in three-body abrasion the hard particles are free to roll and slide between two, perhaps dissimilar, sliding surfaces.