Assertion: xenon | /r/AtLocation | the earth's atmosphere
Facets:
Source sentences:
text: Xenon is a trace gas found in the Earth's atmosphere to the extent of about one part in 20 million,
text: It is a colorless, dense, odorless noble gas found in Earth's atmosphere in trace amounts.
text: Xenon is found in the Earth's atmosphere and it is extracted from liquified air.