Assertion: acid rain | /r/CapableOf | weaken a layer of shale
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Source sentences:
text: A 2018 study examining the 2009 Jiweishan landslide in southwest China proposed that acid rain may have weakened a layer of shale that separated the rock layers containing an aquifer above from the rock layers containing a mine below, which caused a large mass of rock to slip off the mountainside and kill 74 people.