Physics & Astronomy
rocks
95%
acids
88%
silicon dioxide
75%
deposits
25%
precipitates
24%
igneous rocks
24%
water
24%
Columbia (Orbiter)
21%
oxides
17%
mars
16%
craters
16%
freezing
14%
minerals
14%
silicates
13%
dissolving
12%
evaporation
10%
saturation
9%
causes
8%
Agriculture & Biology
silica
100%
rocks
96%
acids
55%
temperature
39%
igneous rocks
25%
ultramafic rocks
25%
water
23%
overland flow
22%
ferric oxide
21%
silicates
17%
evaporation
14%
oxides
13%
freezing
12%
minerals
10%
Earth & Environmental Sciences
silica
79%
acid
62%
chemical
48%
rock
48%
oxide
21%
phyllosilicate
16%
ultramafic rock
16%
igneous rock
14%
crater
13%
Mars
13%
water
12%
freezing
12%
modeling
11%
silicate
11%
evaporation
11%
dissolution
10%
saturation
10%
mineral
7%
temperature
5%
Chemical Compounds
Amorphous Material
45%
Ferric Oxide
42%
Flow
42%
pH Value
41%
Acid
34%
Evaporation
29%
Mineral
26%
Dissolution
24%
Oxide
17%
Surface
10%