The answers would be:
Loess
Hills
Sand dunes
This is why:
Loess is made of silt that were wind blown from vertical cliffs.
Sand dunes are basically hills of sand. They form when wind is impeded by a rock and it drops some of the sand as it hits the rock. Slowly the deposited sand builds up to form bigger dunes.
Hills since sand dunes are hills also, this is also considered a formation made by wind deposition.
