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isotopes(155)
agricultural lands(154)
trace elements(153)
heavy metals(152)
sedimentation(152)
grasslands(144)
islands(144)
iron(138)
landscape(135)
radar(120)
absorption(117)
contaminants(112)
sediments(112)
erosion(107)
particulate matter(96)
particulates(96)
convection(95)
conservation(92)
frozen ground(87)
methane(86)
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