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surface water(502)
lakes(150)
rivers(137)
water resources(78)
sediment(72)
water pollution(68)
wetlands(54)
fresh water(49)
seasons(42)
salinity(41)
sea water(40)
climate change(37)
water quality(37)
ecosystems(35)
freshwater fish(35)
phytoplankton(32)
rain(30)
flooding(29)
polymerase chain reaction(28)
habitats(27)
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