Earth & Environmental Sciences
coal
80%
basin
61%
Paleocene
33%
moisture content
21%
maceral
19%
Miocene
19%
geothermal gradient
19%
tuff
16%
lignite
16%
depositional environment
16%
peat
15%
fluorescence
14%
microscopy
13%
heating
11%
lithotype
10%
mire
9%
coal rank
9%
X-ray fluorescence
8%
coal seam
7%
reflectance
7%
outcrop
7%
geochemistry
6%
hydrogen
6%
texture
6%
quartz
5%
acid
5%
sampling
4%
carbon
4%
history
4%
analysis
4%
loss
4%
energy
3%
comparison
3%
Engineering & Materials Science
Coal
100%
Deposits
28%
Peat
20%
Moisture
18%
Lignite
17%
Geochemistry
12%
Fluorescence microscopy
10%
Heating
10%
Bituminous coal
9%
Fluorescence
8%
Quartz
7%
Optical microscopy
7%
Luminance
6%
Aluminum oxide
6%
Acids
6%
Ignition
6%
Fires
5%
Textures
5%
Hydrogen
5%
Carbon
5%
Sampling
5%