Assertion: radon | /r/HasProperty | occurring gas
Facets:
value: naturally
type: MANNER
Source sentences:
text: Radon is a naturally occurring gas and is difficult to eliminate entirely — but lowering the level of radon is crucial for a home to be safely lived in, bought, or sold.
text: Radon is a naturally occurring gas that seeps into buildings from the surrounding soil.
text: Radon is a naturally occurring gas that is radioactive and can cause lung cancer.
text: Radon is a naturally occurring gas that seeps out of rocks and soil.
text: Radon is a naturally occurring gas formed from the natural (radioactive) breakdown of uranium in rock, soil and water.