What is a common feature of constructional landforms?

The correct answer highlights that constructional landforms are primarily formed by the deposition of sediments. These landforms develop through the accumulation and layering of materials, such as sand and gravel, that are transported by water, wind, or ice. Over time, as these materials settle, they build up to create features like deltas, beaches, and floodplains. The process of sediment deposition is essential in shaping these landforms, distinguishing them clearly from other types of landforms that result from different geological processes.

Understanding the formation process of constructional landforms through sediment deposition helps in recognizing their characteristics, which includes their diverse shapes and structures influenced by the nature of the sediments and the environment in which they occur. This is in contrast to other features that may involve soil compaction or flat surfaces; these attributes do not effectively define constructional landforms, which are marked by their genesis through sediment accumulation.