Physics & Astronomy
mars
78%
energy sources
74%
rocks
63%
fracturing
57%
potential energy
56%
hydrogen
40%
biosphere
35%
gases
34%
crusts
27%
microorganisms
26%
friction
18%
breakdown
17%
oxidation
16%
fluids
13%
estimates
12%
water
12%
Earth & Environmental Sciences
energy source
64%
cataclasite
63%
Mars
61%
hydrogen
51%
gas
33%
rock
32%
protolith
24%
biosphere
22%
seismicity
20%
faulting
19%
friction
17%
microorganism
16%
crust
16%
oxidation
14%
fluid
12%
water
6%
Medicine & Life Sciences
Mars
100%
Friction
81%
Hydrogen
77%
Gases
56%
Water
44%
Recurrence
38%
Agriculture & Biology
rocks
64%
hydrogen
60%
gases
50%
energy
39%
biosphere
26%
friction
21%
fluids
16%
oxidation
16%
microorganisms
14%
water
9%
sampling
7%