World Geography Dead Zones Mantle Plume Arctic Region Senile population Sudden Stratospheric Warming Analyse the various theories tried to explain the distribution of ocean and the continents? What are polymetallic nodules? Highlight their geographical distribution and state their significance. What are atmospheric lakes? Highlight their characteristics. What do you understand about tsunamigenic zones? Giving an account of their global distribution, explain the propagation of tsunamis. Describe in brief the causes and impact of Glacier melting. Discuss the role of western disturbances in causing cold waves in India and explain how La Nina conditions can affect the severity of cold waves. What is the mechanism of tricellular meridional circulation of the atmosphere? Discuss its significance With reference to the theory of plate tectonics, discuss the various types of plate tectonic boundaries around the world. Poor soil management will erode food security. Explain what do you mean by weathering. Discuss the significance of weathering. Give a brief note on the structure of Earth and its composition.