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 How is this determined?
How is this determined?
| water 71 soil 51 Minerals 33 Iron 21 environment 20 salt 16 Nutrients 15 pollution 10 lead 10 precipitation 10 CO2 10 Magnesium 9 Calcium 9 tropical 8 Fluoride 7 Sulfate 6 Carbon dioxide 6 radiation 6 irrigation 6 Potassium 6 Uranium 6 Silica 5 gypsum 5 Strontium 5 Mercury 4 Arsenic 4 | carbon cycle 4 nitrogen 4 algae 4 recycling 4 sodium 4 emissions 4 Sulfides 4 weather 4 carbon storage 4 lakes 3 global warming 3 freshwater 3 Iron oxides 3 Cactus 3 heavy metals 3 cyanobacteria 3 Phosphorus 3 agriculture 3 carbon sequestration 3 rice 3 orange 3 summer 3 Thorium 3 oxalic acid 3 global cooling 3 |