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.
You must be able to describe and explain the formation of each of these features with named examples (it is useful to be able to back up your explanation with a labelled diagram). Beaches are the main features of coastal deposition.A beach is defined as the gently sloping area of land between the high and low water marks. Remember, beaches are not permanent features as their shapes are altered by waves.here are a few features that have occurs as result of the the Ice Ages ending. Is larger than a river mouth, for example the river Thames, and resulted from a river that flowed out into the sea from a valley with low hills on either side.