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soils(9)
carbon(3)
methane(2)
organic carbon(2)
altitude(1)
ammonia(1)
condensation(1)
deltas(1)
drought(1)
droughts(1)
erosion(1)
glaciers(1)
grasslands(1)
ground water(1)
heavy metals(1)
ice floes(1)
iron(1)
islands(1)
landscape(1)
loess(1)
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