Identifying the key geographical processes and interactions in questions from previous years papers is essential to understand the underlying concepts and prepare effectively for the UPSC exam. Here are some techniques to help you identify these key aspects:

1. Read the Question Carefully: Begin by reading the question attentively to grasp its context and identify the geographical processes and interactions it involves. Pay attention to the keywords and phrases that indicate specific geographical concepts.

2. Analyze the Question Structure: Break down the question into its components to identify the key elements related to geographical processes and interactions. Look for verbs that indicate actions or processes, and nouns that indicate the entities involved in the interactions.

3. Identify Geographic Themes: Identify the primary geographic themes or concepts related to the question. These themes can include physical geography (landforms, climate, etc.), human geography (population, urbanization, etc.), economic geography (trade, resources, etc.), or political geography (borders, governance, etc.).

4. Highlight Key Phrases: Highlight or underline the key phrases in the question that pertain to geographical processes and interactions. These phrases may include terms such as "geographic patterns," "spatial relationships," "interactions between," or "impact on the environment."

5. Use Previous Year Papers and Marking Schemes: Reviewing previous year papers and their marking schemes can provide insights into the types of questions asked and the key geographical processes and interactions that are frequently tested. Look for common patterns and topics that recur in these papers.

6. Refer to Study Materials: Utilize relevant study materials such as textbooks, reference books, or online resources specifically designed for UPSC preparation. These resources often provide comprehensive coverage of geographical processes and interactions, helping you understand the key concepts in depth.

7. Practice with Sample Questions: Solve sample questions and mock tests that focus on geographical processes and interactions. This practice will help you become familiar with the types of questions asked and improve your ability to identify the key geographical aspects quickly.

By following these techniques, you can effectively identify the key geographical processes and interactions in questions from previous years papers. Remember to practice regularly and revise the concepts thoroughly to enhance your chances of success in the UPSC exam.