Subject	saltwater aquarium
Predicate	be more difficult than
Object	freshwater aquarium
Modality	Modality Occurrences
Polarity	POSITIVE
Plausibility	0.0019
Neighborhood Sigma	0.0020
Local Sigma	1.0000
Example Sentences	Sentence Occurrences Source a saltwater aquarium is more difficult than a freshwater aquarium 1 Answers.com Questions