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population(27)
carbon(21)
lead(13)
density(12)
precipitation(12)
magnetic field(11)
diffusion(10)
emissions(10)
conservation(9)
electric field(9)
lakes(9)
atmosphere(8)
dispersion(8)
heat(8)
vegetation(8)
velocity(8)
boundaries(7)
minerals(7)
oxygen(7)
sea ice(7)
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