Assertion: magma's component | /r/AtLocation | significant concentrations
Facets:
value: in most surface waters
type: LOCATION
value: naturally
type: MANNER
Source sentences:
text: The most abundant components of ash leachates (Ca, Na, Mg, K, Cl, F and SO 4 ) occur naturally at significant concentrations in most surface waters and therefore are not affected greatly by inputs from volcanic ashfall, and are also of low concern in drinking water, with the possible exception of fluorine.