sediment
Beaches or deltas
The "sand dunes and deltas" are similar to that they are both "formed by weathering".
Deltas are formed by constructive erosion.
Deltas are created by deposition.
the word for that is deposition
They are formed by deposition of sediments from rivers and streams.
They have all been formed by Sandblasting
deltas
The Grand Canyon was formed mainly due to the Colorado river, and also due to uplift pronouncing the scale of the canyon; it is not formed due to a delta, as deltas are only formed at the mouth of the river, not in its middle course.
You could be thinking of a delta or abyssal plains.
They have all been formed by Sandblasting