No, they are examples of deposition, not erosion.
Deposition
Both form weather dune is has sand delta water
deltas
The "sand dunes and deltas" are similar to that they are both "formed by weathering".
Erosion is helpful because it helps make beaches, sand dunes, and deltas. Erosion does not make these landforms, deposition does, but erosion links with deposition. Erosion is also damaging because it washes away soil and clogs waterways
wind erosion creates sand dunes
Deltas are created by pieces of rock being weathered, washed away by erosion and deposition at the mouth of the river where it meets an ocean. Beaches are created by deposition of sand by waves. Dunes are created by erosion of sand by wind.
erosion
Sand dunes.
Wind erosion is the primary process that forms sand dunes. As wind moves across a landscape, it picks up loose sand particles and deposits them in areas where the wind slows down, creating dunes. Over time, the accumulation of sand particles builds up into the characteristic shape of sand dunes.
wind erosion creates sand dunes
Sand dunes are formed by wind, which is one kind of erosion.