Assertion: heavy metal | /r/AtLocation | soil
Facets:
value: naturally
type: MANNER
value: into water sources
type: TRANSITIVE-OBJECT
value: in source materials
type: LOCATION
Source sentences:
text: Heavy metals are used in various industries, so they are common pollutants found in water, food, air and soil.
text: Heavy metals occur naturally in soils and in source materials used to manufacture fertilizers.
text: They occur naturally in the soil and leach into water sources, but there are plenty of man-made sources as well.
text: Although heavy metals are naturally present in the soil, geologic and anthropogenic activities increase the concentration of these elements to amounts that are harmful to both plants and animals.
text: They are therefore found naturally in soils and rocks with a subsequent range of natural background concentrations in soils, sediments, waters and organisms.