Earth & Environmental Sciences
halogen
96%
methane
64%
groundwater
51%
iodine
40%
bromine
28%
bedrock
21%
chloride
18%
groundwater control
18%
well
16%
horizontal drilling
15%
oil
14%
shale gas
12%
gas
12%
hydraulic fracturing
11%
brine
10%
public health
10%
tracer
9%
chemical composition
9%
geology
9%
calcium
9%
water resource
9%
sodium
9%
public
8%
parameter
4%
Engineering & Materials Science
Groundwater
100%
Methane
78%
Iodine
48%
Bromine
37%
Horizontal drilling
16%
Oils
15%
Geology
15%
Shale gas
15%
Water resources
15%
Hydraulic fracturing
14%
Public health
14%
Brines
14%
Tracers
14%
Calcium
13%
Sodium
12%
Process control
11%
Characterization (materials science)
10%
Chemical analysis
7%
Chemical Compounds
Groundwater
91%
Halogen
74%
Methane
67%
Iodine
31%
Bromine Atom
22%
Gas
19%
Chloride
14%
Calcium(0)
9%
Sodium Atom
7%
Chemistry
7%