Assertion: sulfur | /r/HasProperty | pumped to the surface
Facets:
value: by applying air pressure
type: MANNER
Source sentences:
text: From there it was pumped to the surface by applying air pressure through the central pipe.
text: Sulfur is recovered commercially from underground deposits using the Frasch Process – superheated water and steam are pumped underground, where they melt the sulfur, allowing it to be pumped to the surface.