Assertion: barnacle's plate | /r/HasProperty | hard calcareous
Facets:
Source sentences:
text: They are cemented to rock (usually), and covered with hard calcareous plates, which they shut firmly when the tide goes out.
text: They are cemented to rock (usually), and covered with hard calcareous plates, which they shut firmly when the tide goes out.
text: Indeed, most barnacles have hard calcareous plates that protect their body.