Assertion: basalt | /r/HasProperty | volcanic rock
Facets:
Source sentences:
text: Basalt is a volcanic rock and one of the most common types of rock in the world.
text: Basalt is a volcanic stone, occurring naturally.
text: Basalt is an igneous, mafic, and volcanic rock which is produced by lava flows in many different volcano types.
text: Basalt is a volcanic stone that has been used in architecture for centuries.