Assertion: thorium | /r/AtLocation | the environment
Facets:
value: naturally
type: MANNER
Source sentences:
text: In the environment, thorium exists in combination with other minerals, such as silica.
text: Since thorium is naturally present in the environment, people are exposed to tiny amounts in air, food and water.
text: In the environment, thorium exists in combination with other minerals, such as silica.