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surface water(14)
population(10)
salinity(5)
oceans(4)
aquifers(3)
conservation(3)
lakes(3)
nitrogen(3)
ph(3)
plankton(3)
water quality(3)
wetlands(3)
carbon(2)
conductivity(2)
density(2)
dispersion(2)
drought(2)
entrainment(2)
forests(2)
heat(2)
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