In large desert areas it is filled with many roots , roots of trees and vegetation hold the sand to the ground stopping it from moving/eroding, but sand sometimes does move when high wind levels occur *hint sandstorm*
It moves a lot that is why you see hill-shaped sand piling up through deserts.
Number 1 is wrong. France lost the 7 Years War to Great Britain, so it had to give territory away. Therefore France is giving Great Britain complete control of the territory.
The rest, as far as I am concerned, are correct.
I think it was Joseph Adonis