Sand dunes in desert areas are dynamic features. Which of the statements below - about these and the corresponding sand transport - is/are true?
Select one or more:
a)
Sand is transported through saltation in the surface load
b)
On the leeward side of the dune, sand is transported through mass movement
c)
Vegetation may stabilize dune migration
d)
Sand grains in a dune are well-sorted and angular
e)
Sand is transported in the suspended load by rolling along the surface
f)
Dunes usually migrate against the wind
g)
None of the alternatives are true