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density(4)
carbon(3)
geomagnetism(3)
emissions(2)
ions(2)
iron(2)
lakes(2)
minerals(2)
sediments(2)
solar wind(2)
altitude(1)
anisotropy(1)
atmospheric temperature(1)
carbon dioxide(1)
conductivity(1)
coronal mass ejections(1)
cryosphere(1)
diagenesis(1)
electric field(1)
electricity(1)
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