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oxygen(3)
biomass(2)
nutrients(2)
precipitation(2)
ammonia(1)
carcinogens(1)
cation exchange capacity(1)
elements(1)
hydrothermal vents(1)
indicator species(1)
infiltration(1)
irrigation(1)
lead(1)
methane(1)
ph(1)
sediments(1)
soil chemistry(1)
soil depth(1)
soil fertility(1)
soil moisture(1)
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