Subject	metamorphic rock
Predicate	be harder than
Object	igneous
Modality	Modality Occurrences
Polarity	POSITIVE
Plausibility	0.0036
Neighborhood Sigma	0.0036
Local Sigma	1.0000
Example Sentences	Sentence Occurrences Source metamorphic rocks are harder than igneous and sedimentary rocks 1 Answers.com Questions