acid

○○○ soak ⪢⪢
Rain has a tiny bit of acid in it and when it _____s through soil, it collects some more. #bookmark
http://qindex.info/i.php?x=16426

○○○ dissolve ⪢⪢
This acid allows it slowly _____ certain kinds of rock like limestone, marble or gypsum.
http://qindex.info/i.php?x=16430

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