How do erosion and deposition work together to form sand dunes? Waves cause erosion along coastlines and deposit sand away from the shore.
Erosion occurs as surface water carries sediment and the sediment is deposited near oceans and lakes.
Glaciers cause erosion through the movement of large chunks of ice, which are deposited and form depressions.
Erosion occurs through deflation, and sand that was picked up is deposited against an obstruction.

The way in which erosion and deposition work together to form sand dunes is: Erosion occurs through deflation, and sand that was picked up is deposited against an obstruction.

Exogenic processes refer to the various processes that occur at or near the surface of planet Earth due to the action (influence) of exogenic forces or geomorphic agents.

In Geology, the five (5) evidence of exogenic processes on Earth's surface include the following:

Deposition is typically a consequence of erosion and it usually result in the laying down of sediment on a landform (landmass), which sometimes make the foundation of buildings stronger to withstand stress.

The formation of sand dunes is generally caused as a result of the effect of both erosion and deposition. Sand dunes are formed when sands are eroded from rocks through deflation, which leads to an accumulation of more sand.

Furthermore, the accumulated sands are picked up by strong winds and then deposited in another location against an obstruction.

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Erosion occurs through deflation, and sand that was picked up is deposited against an obstruction.

Explanation:

Erosion can be defined as a geological process which involves the wearing away of earth material and transportation of these material  to another location by Natural agents such as wind and water. Erosion involves removal of top soil, rocks and other earth particles by action of wind, glacier and water.

Wind causes erosion by deflation. Deflation is the actual removal of grain of rocks . Generally, it s the lowering of land surface that happens as a result of removal of surface particles(sands grains) by wind. Deflation is usually prevalent in arid areas. This sand can later be picked up and deposited to form sand dunes . Sand dunes are mounds of sand formed by wind . This sands are sheltered by an obstacle. And sand dunes are prevalent in desert and or along the beach. The sand dune grows as sand accumulate.