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Figure 4.
Rock type influences river water chemistry. Red symbols indicate basins with distinct water chemistry highlighted in Figures 3 and 5. (A) Total dissolved solids (TDS) and field conductivity are well correlated. (B) Positive correlation of Na with SO4 and Cl suggests evaporite source of these solutes. (C) No correlation between percent basin area used for agriculture and total dissolved solids or conductivity. (D) Basins underlain by marine and mafic rocks have higher river water TDS.
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