Assertion: aqueduct's conduit | /r/MadeOf | stone
Facets:
value: usually
type: TEMPORAL
value: below the surface of the earth
type: LOCATION
value: mostly
type: DEGREE
Source sentences:
text: Only a portion of Rome’s aqueduct system actually crossed over valleys on stone arches (50 km out of a total of about 420 km); the rest consisted of underground conduits made mostly of stone and terra-cotta pipe but also of wood, leather, lead, and bronze.
text: Conduits are made of lead, stone, cast iron, wood, &c., above or below the surface of the earth.
text: Early aqueducts redirected water by use of conduits (covered canals, or pipes, usually made of stone) that were often buried a few inches below ground for protection.