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geochemistry × 13
atmosphere × 8
carbon-cycle × 7
atmospheric-chemistry × 5
carbon × 5
geobiology × 5
biomass × 5
earth-history × 3
mineralogy × 3
co2 × 3
limestone × 3
fossils × 2
paleontology × 2
forest × 2
great-oxidation-event × 2
geology × 1
climate-change × 1
geophysics × 1
plate-tectonics × 1
models × 1
planetary-science × 1
rocks × 1
measurements × 1
