Historical trace metal loading to a large river recorded in the sediments of Lake St. Croix, USA

Agriculture & Biology

• trace elements 100%
• sediments 91%
• lakes 81%
• rivers 78%
• atmospheric deposition 17%
• valleys 16%
• Minnesota River 11%
• Wisconsin River 10%
• suspended sediment 9%
• eroded soils 9%
• history 8%
• metals 8%
• Mississippi River 8%
• pollution load 7%
• stream channels 7%
• metropolitan areas 7%
• anthropogenic activities 6%
• stable isotopes 6%
• heavy metals 5%
• stems 3%
• soil 2%

Earth & Environmental Sciences

• trace metal 96%
• lake 58%
• river 48%
• sediment 47%
• accumulation rate 26%
• atmospheric deposition 13%
• valley 12%
• tributary 11%
• stream channel 7%
• metal 7%
• history 6%
• aquatic system 6%
• twentieth century 6%
• trend 6%
• metropolitan area 6%
• suspended sediment 6%
• sediment core 5%
• lacustrine deposit 5%
• stem 5%
• creek 5%
• soil 5%
• stable isotope 5%
• heavy metal 4%
• contamination 4%
• world 3%