| http://www.w3.org/ns/prov#value | - Interconnected by diffusion through the sand, they work as a system: nitrifying bacteria metabolize ammonia into nitrate and denitrifying bacteria reduce the nitrate to nitrogen gas; some nitrate reducers use nitrate to oxidize hydrogen sulfide; other bacteria break down organic compounds via fermentation while others reduce iron and other metals which rooted plants absorb; yet others aerobically
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