This video or animation explains the process of formation of meanders. Geophysical pheonomenon is a part of Mains paper 1 syllabus. You do not have to be a geography expert to clear UPSC Civil Services Examination. What you need is an informed opinion about these geographic issues to crack the Civil Services Prelims as well as Mains examination. As an IAS officer, you are going to be a generalist and not a specialist.