Assertion: fir's bark | /r/CapableOf | become thick
Facets:
value: with horizontal fissures over time
type: OTHER
Source sentences:
text: As the tree matures, the bark becomes thick and scaly with furrows or ridges running vertically.
text: The bark of young trees is grey-green with highly scented blisters, and becomes purple-brown, thick and corky with horizontal fissures over time.