glaciers
wind
water
none of the above
.
never be greater than 100 %
take values only from 0 % to 100 %
be less than 0 %
be greater than 100 %
loess
talus
drift
dune sand
one phase system
two phase system with soil and air
two phase system with soil and water
three phase system
S>0
S<0
0<S<100
0 < S < 100