1 Insertion â when a base is added to the sequence. 2  Deletion â when a base is deleted from the sequence.  Copy number variation (CNV) is a type of mutation where large chunks of DNA are inserted, repeated or lost. These regions of DNA can be between 10,000 and 5,000,000 bases long.
Wind deposition can result in dunes and loess deposits.
Surfaces loaded with such particles are called desert pavement or reg and sometimes resemble a worn, polished cobblestone street surface. Depositional Landforms Sand dunes are the most noticeable landforms produced by wind erosion and deposition of sediment.The largest dune fields are found in the Middle East and North Africa. Most large dune fields act more or less as closed systems.Once sand enters these systems, it does not leave.olian landforms are found in regions of the Earth where erosion and deposition by wind are the dominant geomorphic forces shaping the face of the landscape. Regions influenced by wind include most of the dry climates of the Earth (Figure 10ah-1).