Pooja, yes you can do MA in geology after your Bcom. Some of the colleges offer ma in geology with minimum 50% in undergraduation in any discipline. It is not compulsory to have BA in graduation. You can check out some of the colleges and their eligibility criteria by the link given below
https://university.careers360.com/colleges/list-of-ma-in-geography-degree-colleges-in-india
Thank you
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