The present book has been specially published for the candidates of 'International Earth Science Olympiad (IESO)' Entrance Test. Based on the current pattern of the exam, the book is highly recommended for the aspirants. Various sections have been provided in the book for detailed study of important subjects of the exam. All the practice questions have been solved by respective subjectexperts. Previous Exam Solved Papers have also been provided for the candidates to be familiar with the exam pattern, the type of questions asked, and their answers. Purple Patches of the Book: The Book based on the Current Pattern of Examination; Specialised Study Material with Previous Exam Solved Papers; Each Topic Discussed Chapterwise in a Lucid Manner in Detail; Each Chapter Contains Sufficient Number of Solved MCQs; Selected MCQs Provided with Detailed Explanatory Answers. Based on the Current Pattern of Exam, the book will prove very useful for study, practice and during precious moments before the exam for reference and revision. It is highly recommended to Sharpen your Problem Solving Skills with thorough practice of numerous questions provided in the book, and prepare yourself to face the exam with Confidence, Successfully.