Assertion: radon | /r/AtLocation | rock
Facets:
value: naturally
type: MANNER
value: usually
type: DEGREE
Source sentences:
text: Radon is found naturally in the soil and rock composing the earth
text: Radon is a radioactive gas found in soil and rock.
text: Radon is found naturally in the soil and rock composing the earth
text: Radon is produced from the natural decay of uranium and radium, found in rocks and soil.
text: It is usually found in rocks and soil but sometimes can be found in well water.
text: Radon is produced from the natural decay of uranium and radium, found in rocks and soil.
text: Radon is a radioactive gas found in rocks, soil, uranium, and the atmosphere.