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.
By the end of this section the student/user will be able to: Describe the mechanisms/processes of how water and wind erosion occur. Accompanying Exercise: (For Students to print off, complete and turn in for a grade) How Water and Wind Erosion Occur- Exercise (pdf) The three steps common to both water and wind erosion: 1. DETACHMENT of soil particles: This action dislodges the particles from the soil by the impact energy of the rain or wind.