Agriculture & Biology
soil formation
100%
sandstone
60%
surface mining
37%
soil
34%
Appalachian region
28%
soil texture
26%
silt
25%
topsoil
24%
water holding capacity
23%
soil properties
22%
electrical conductivity
22%
leaching
21%
soil organic matter
21%
cations
19%
sand
19%
vegetation
16%
grasses
16%
oxidation
16%
iron
16%
Earth & Environmental Sciences
siltstone
36%
soil
28%
sandstone
25%
parent material
18%
soil texture
18%
topsoil
16%
electrical conductivity
15%
soil property
14%
silt
14%
grass
14%
cation
14%
incorporation
14%
leaching
12%
organic matter
11%
iron
11%
oxidation
11%
sand
10%
vegetation
10%
material
6%
water
5%
effect
3%