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Classification of mountains is explained by Dr. Manishika Jain based on 3 types: 1. Based on geography a. Mountain Ridge b. Mountain Range c. Mountain System d. Cordillera 2. Based on period of origin a. Pre-Cambrian b. Caledonian c. Hercyian d. Alpine 3. Based on process of origin a. Fold mountains b. Fault mountains c. Volcanic mountains d. Denuded or Erosional Mountains IAS Mains Geography optional postal course visit - http://www.examrace.com/IAS/IAS-FlexiPrep-Program/Postal-Courses/Examrace-IAS-Geography-Series.htm For Maps and locations books click here - http://www.examrace.com/IAS/IAS-FlexiPrep-Program/Postal-Courses/Examrace-IAS-Geography-Maps-Series.htm CBSE NET Geography optional postal course visit - http://www.examrace.com/CBSE-UGC-NET/CBSE-UGC-NET-FlexiPrep-Program/Postal-Courses/Examrace-CBSE-UGC-NET-Geography-Series.htm Lectures organised in topics and subtopics: https://www.doorsteptutor.com/Exams/IAS/Mains/Optional/Geography/