Assertion: hydrogen sulfide | /r/AtLocation | well
Facets:
value: often
type: TEMPORAL
Source sentences:
text: Hydrogen sulfide often is present in wells drilled in shale or sandstone, or near coal or peat deposits or oil fields.
text: Hydrogen sulfide often is present in wells drilled in shale or sandstone, or near coal or peat deposits or oil fields.
text: Hydrogen sulfide often is present in wells drilled in shale or sandstone, or near coal or peat deposits or oil fields.
text: Hydrogen sulfide often is present in wells drilled in shale or sandstone, or near coal or peat deposits or oil fields.