Earth & Environmental Sciences
geographical variation
97%
isotope
60%
groundwater
49%
agricultural product
37%
rock
34%
rainwater
31%
provenance
29%
water
24%
aquifer
22%
vegetable
20%
organism
13%
sulfur isotope
12%
spring water
11%
sea salt
11%
sedimentary rock
9%
stable isotope
8%
lithology
8%
environmental factor
8%
weathering
8%
geology
7%
human activity
7%
drinking water
7%
aerosol
7%
atmosphere
6%
material
4%
distribution
3%
analysis
2%
Engineering & Materials Science
Isotopes
100%
Groundwater
96%
Rocks
60%
Water
44%
Agricultural products
43%
Aquifers
39%
Vegetables
26%
Springs (water)
16%
Sedimentary rocks
16%
Lithology
14%
Geology
13%
Potable water
12%
Weathering
12%
Aerosols
12%
Sulfur
9%
Salts
9%
Chemical analysis
6%
Chemical Compounds
Groundwater
87%
Isotope
70%
Sea Salt
16%
Weathering
12%
Stable Isotope
11%
Aerosol
10%
Drinking Water
10%
Chemical Element
7%
Resistance
6%
Chemistry
5%