Assertion: oak's wood | /r/HasProperty | hard
Facets:
Source sentences:
text: Wood of oak is very strong and hard.
text: The wood of pin oak trees is heavy, dense and hard and commonly used to make firewood.
text: The wood is hard and heavy and is used in general construction and for firewood.
text: The wood is hard and tough, and has been used since ancient times for general construction purposes as pillars, tools, wagons (Hesiod, Works and Days 429), vessels and wine casks.