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soil chemistry(2)
urban areas(2)
water quality(2)
absorption(1)
agriculture(1)
altitude(1)
ammonia(1)
atmosphere(1)
bioturbation(1)
calcium(1)
carbon dioxide(1)
chlorophyll(1)
cyclones(1)
degradation(1)
desertification(1)
diffusion(1)
earthquakes(1)
erosion(1)
estuaries(1)
evaporation(1)
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