Assertion: plutonium | /r/HasProperty | rare
Facets:
value: in nature
type: LOCATION
value: at the time
type: TEMPORAL
value: slightly
type: DEGREE
value: in azure mines
type: LOCATION
value: relatively
type: DEGREE
Source sentences:
text: In nature, plutonium is relatively rare, occurring in uranium rich ores in trace amounts; most of the world's working supply of this element is obtained through neutron bombardment of uranium, a close neighbor on the periodic table.
text: Plutonium is a slightly rare ore in Azure Mines that is found at 700m - 1999m.
text: At the time, plutonium was a rare liquid that had only recently been isolated in a University of California laboratory.
text: Plutonium is a rare element, used mainly as nuclear fuels and the core ingredient of nuclear weapons.
text: Because plutonium is so rare, average consumers will rarely, if ever interact with it, and people who utilize the element in their work are usually given meticulous safety training.
text: The reason that plutonium (and other transuranic elements) are so rare in nature is that being radioactive, they decay with a characteristic half-life.