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%