Assertion: arsenic | /r/AtLocation | rock
Facets:
value: often
type: TEMPORAL
Source sentences:
text: It can be found in rock and soil, with trace amounts in some areas and heavy concentrations in others.
text: Arsenic is a natural element that can be found in rocks and soil, water, air, and in plants and animals.
text: : Arsenic is a naturally occurring semi-metal element found in rocks, soil, water, plants, and even animals .
text: Arsenic is often found in rocks that contain other valuable metals, such as copper and lead.
text: It can be found in soil, rocks, and minerals.