Assertion: technetium | /r/AtLocation | the earth's crust
Facets:
value: naturally
type: MANNER
value: very
type: DEGREE
value: in red supergiant stars
type: LOCATION
Source sentences:
text: Technetium occurs naturally in the Earth's crust in minute concentrations of about 0.003 parts per trillion.
text: Wait a minute, if technetium exists in the Earth's crust and in red supergiant stars, why is it labeled an artificial element?
text: Technetium occurs in the Earth’s crust as minute traces from the spontaneous fission of uranium; the relatively short half-lives preclude the existence of any primordial technetium on Earth.
text: Because it isn’t very present in the Earth’s crust, technetium is typically produced synthetically.
text: Technetium does occur naturally in the Earth's crust, being formed by the nuclear fission of uranium atoms, but the amounts are minute.