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geochemistry × 191geology × 56
mineralogy × 39
volcanology × 30
oceanography × 22
geophysics × 21
petrology × 20
earth-history × 13
biogeochemistry × 12
minerals × 11
planetary-science × 11
atmosphere × 10
atmospheric-chemistry × 8
mantle × 8
igneous × 8
crystallography × 8
geochronology × 8
rocks × 7
sedimentology × 7
groundwater × 7
water × 6
homework × 6
core × 6
uranium × 6
plate-tectonics × 5
