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earth × 29geology × 12
astronomy × 6
evolution × 3
geography × 3
environment × 2
climate-change × 2
young-earth-creationism × 2
economics × 1
physics × 1
religion × 1
islam × 1
china × 1
aviation × 1
india × 1
mathematics × 1
religious-texts × 1
bible × 1
climatology × 1
ecology × 1
hinduism × 1
magnets × 1
air × 1
atmosphere × 1
