Assertion: mineral's oxygen | /r/HasProperty | useful
Facets:
value: in the production of fuel
type: PURPOSE
value: very
type: DEGREE
value: potentially
type: DEGREE
Source sentences:
text: The gases of the solar wind could be useful for future lunar bases, because oxygen, hydrogen (water), carbon and nitrogen are not only essential to sustain life, but are also potentially very useful in the production of fuel.