Earth & Environmental Sciences
lichen
100%
trace metal
89%
fungus
80%
zinc
75%
geogenic source
72%
titanium
67%
cadmium
60%
petrol
58%
aluminum
55%
cobalt
48%
chromium
41%
nickel
40%
temporal record
36%
matrix
27%
metal
27%
industrial activity
24%
smelting
24%
coal combustion
24%
industrialization
24%
pollutant source
24%
environmental protection agency
22%
biomarker
21%
mass spectrometry
19%
continent
18%
atmospheric pollution
18%
dating
17%
copper
16%
contamination
15%
iron
15%
industry
14%
modeling
9%
Agriculture & Biology
lichens
94%
trace elements
92%
titanium
61%
zinc
58%
fungi
55%
aluminum
50%
cadmium
49%
gasoline
41%
cobalt
39%
chromium
37%
nickel
36%
sampling
32%
metals
27%
Usnea
27%
Trametes
27%
Cladonia
26%
smelting
25%
United States Environmental Protection Agency
23%
industrialization
22%
combustion
19%
coal
19%
biomarkers
16%
pollution
15%
mass spectrometry
15%
copper
14%
iron
13%
industry
12%