Assertion: acid rain | /r/HasProperty | discovered in 19th century
Facets:
value: by robert angus smith
type: OTHER
Source sentences:
text: Acid rain was discovered in the 19th century by Robert Angus Smith, a pharmacist from Manchester (England), who measured high levels of acidity in rain falling over industrial regions of England and contrasted them to the much lower levels he observed in less polluted areas near the coast.