Subject	uranium
Predicate	undergo
Object	fission
Modality	Modality Occurrences some[subj/a chain reaction occur when] 1
Polarity	POSITIVE
Plausibility	0.8722
Neighborhood Sigma	0.8723
Local Sigma	0.8990
Example Sentences	Sentence Occurrences Source uranium undergo fission 4 Google Autocomplete uranium 235 undergo fission 1 Google Autocomplete a chain reaction occur when uranium 235 undergoes fission 1 Answers.com Questions