Earth & Environmental Sciences
chemical alteration
77%
nitrogen isotope
65%
organic nitrogen
63%
hyaloclastite
61%
seafloor
46%
rock
20%
trace fossil
16%
greenstone belt
16%
fluid
16%
hydrothermal alteration
15%
igneous rock
14%
illite
14%
Mars
13%
stabilization
11%
basalt
11%
incorporation
11%
silicate
11%
glass
10%
ion
9%
chemical
7%
river
6%
Physics & Astronomy
nitrogen isotopes
100%
volcanology
81%
rocks
54%
signatures
45%
Mars surface
25%
igneous rocks
24%
illite
23%
basalt
20%
rivers
18%
shift
17%
fluids
16%
tracing
15%
silicates
13%
stabilization
12%
interactions
11%
nitrogen
10%
glass
8%
ions
6%
Agriculture & Biology
organic nitrogen
69%
isotopes
58%
rocks
55%
igneous rocks
34%
volcanic rocks
31%
illite
30%
fluids
28%
basalt
26%
silicates
22%
glass
16%
rivers
14%
ions
13%
nitrogen
11%
sampling
6%