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.
Importance of Coastal Sand Dunes Patterns and Processes Blowouts Parabolic Dunes Transgressive Dunefields. Introduction. Sand dunes are formed at the interface between the sea and land. They are formed from sand which is eroded and ground rock, derived from terrestrial (e.g., glacial or river) and oceanic sources (e.g., coral reefs).