Subject	acid rain
Predicate	can affect
Object	river
Modality	Modality Occurrences TBC[surrounding environment] 1
Polarity	POSITIVE
Plausibility	0.1604
Neighborhood Sigma	0.1639
Local Sigma	1.0000
Example Sentences	Sentence Occurrences Source acid rain can affect a river and the surrounding environment 2 Answers.com Questions