Assertion: conch's shell | /r/HasProperty | calcium carbonate
Facets:
value: generally
type: DEGREE
Source sentences:
text: The shell is generally composed of calcium carbonate, which is secreted by the outer surface of the mantle (covering) of the shell as the creature ages.
text: Mollusks are soft bodies animals that may have a hard external shell composed of calcium carbonate, a hard internal shell, or no shell at all.
text: Some of them have developed hard external or internal shells to protect them, e.g. the Fighting conch which is protected by an external shell composed of calcium carbonate.