The correct answer is - examples of constructive erosion.
Both deltas and moraines are examples of constructive erosion. This means that they are formed as a result of erosion processes which have created the founding basis for their formation with the deposition of the eroded material.
The deltas are formed from the deposition of sediment that is carried by the river and once the river enters at a place where the water is stagnant or slow-moving and deposits the material that it has initially eroded.
The moraines form from the erosion caused by the glacieres. As the glacier moves it is breaking and tearing apart rocks and soil from both sides of its path. This material is deposited on the top of the edges of the glacier, and the moraines are usually found in matching ridges that are on both sides of the glacier itself.
