Assertion: oyster's valve | /r/HasProperty | flat
Facets:
value: almost
type: DEGREE
value: in oysters
type: LOCATION
Source sentences:
text: The lower valve, fixed to the bottom or to another surface, is larger, has smoother edges, and is rather flat.
text: The upper valve is thinner and flat while the lower one thicker and convex.
text: The left valve is cupped, while the right valve is flat.
text: In oysters the lower valve may be almost flat while the upper valve develops layer upon layer of thin horny material reinforced with calcium carbonate.