Assertion: surfer's surfboard | /r/HasProperty | bobbing on the surface of the ocean
Facets:
value: due to the underwater anchoring point
type: CAUSE
Source sentences:
text: A surfboard that appears to be bobbing up and down on the surface of the ocean due to the underwater anchoring point, e.g., the unseen surfer, is tombstoning.
text: A surfboard that appears to be bobbing up and down on the surface of the ocean due to the underwater anchoring point, e.g., the unseen surfer, is tombstoning.