Subject	subduction zone
Predicate	occur
Object	often
Modality	Modality Occurrences
Polarity	POSITIVE
Plausibility	0.9705
Neighborhood Sigma	0.9807
Local Sigma	1.0000
Example Sentences	Sentence Occurrences Source subduction zones often occur 1 Google Autocomplete subduction zones and fold mountain belts often occur to be close 1 Answers.com Questions