Question

a geologist is studying a sand dune. the sand dune was formed as wind deposited sand against an obstruction. what process created the sand dune? abrasion deflation weathering compaction

Explanation:

Abrasion is the process of wearing away by friction. Deflation is the removal of loose sediment by wind. Weathering is the breaking down of rocks. Compaction is the process of pressing sediments together. Sand dunes are formed by wind - deposited sand against an obstruction, which is related to deflation as deflation leaves behind coarser particles and the sand that is not removed (by deflation) can accumulate to form sand dunes.

Answer:

deflation