○○○ 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

○○○ nutrient ⪢⪢
In the Rocky Mountains beaver dams slowly filter billions of tons of water. The ponds build up soil and nutients and help prevent floods and droughts.
http://qindex.info/i.php?x=11754

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