Subject	lichen
Predicate	can cause
Object	weathering
Modality	Modality Occurrences TBC[mechanical weathering] 1
Polarity	POSITIVE
Plausibility	0.6802
Neighborhood Sigma	0.6802
Local Sigma	0.7056
Example Sentences	Sentence Occurrences Source lichens can cause weathering 2 Google Autocomplete lichens can cause mechanical weathering 1 Answers.com Questions