Assertion: aquifer's amount | /r/HasProperty | produced
Facets:
Source sentences:
text: A small amount of natural tritium is produced when cosmic ray neutrons interact in the upper atmosphere with nitrogen, but that process introduces only about 5 to 10 TU into precipitation and surface water (Clark and Fritz, 1997).
text: It is best to manage the gas cap effectively, that is, placing the oil wells such that the gas cap will not reach them until the maximum amount of oil is produced.