Subject	rock gypsum
Predicate	be formed
Object	weathering
Modality	Modality Occurrences
Polarity	POSITIVE
Plausibility	0.0016
Neighborhood Sigma	0.0060
Local Sigma	0.0546
Example Sentences	Sentence Occurrences Source rock gypsum is formed by weathering and erosion cooling of magma precipitation from a water solution or re crystallization from high temperatures and high pressures 1 Answers.com Questions