Assertion: radon | /r/HasProperty | generated by certain building materials
Facets:
value: in water
type: LOCATION
value: in rocks
type: LOCATION
value: in materials
type: OTHER
value: constantly
type: TEMPORAL
value: in soil
type: LOCATION
Source sentences:
text: Radon is constantly being generated by the radium in rocks, soil, water and materials derived from rocks and soils, such as certain building materials.