Assertion: barnacle's plate | /r/CapableOf | close up the top
Facets:
Source sentences:
text: The second type of barnacle is the acorn barnacle, which is a rounded hexagon of six plates attached at the wider base to a rock, dock, or other object and that narrows to the apex in a volcanic sort of way having another two plates to close up the top, when necessary, or open to allow the six pairs of legs to extend out with the elegant, feathery plumes that are characteristic of their “feet”.