Notes and Study material for Exams
Relief and Structure of Goa Goa is almost entirely covered by rocks of the Goa Group belonging to the Dharwar Super Group of the ArchaeanlProterozoic age, except for a narrow strip at the north-eastern corner occupied by Deccan Trap of the Upper Cretaceous-Lower Eocene age. The Goa Group consisting of green ‘schist species of metamorphic … Read more
Three Geological divisions: The peninsular block The Himalayas and other Peninsular Mountains Indo-Ganga-Brahmaputra Plain Peninsualar block is made of gneisses (metamorphic) and granites (igneous). Six physiographic divisions: The Northern and North-eastern Mountains The Northern Plain The Peninsular Plateau The Indian Desert The Coastal Plains The Islands Northern and North-Eastern Mountains Approximate length of the … Read more
Earthquakes occur when energy stored in elastically strained rocks is suddenly released. This release of energy causes intense ground shaking in the area near the source of the earthquake and sends waves of elastic energy, called seismic waves, throughout the Earth. Earthquakes can be generated by bomb blasts, volcanic eruptions, sudden volume changes in … Read more
Bureau of Indian Standards , based on the past seismic history, grouped the country into four seismic zones, viz. Zone-II, -III, -IV and –V. Of these, Zone V is the most seismically active region, while zone II is the least. The Modified Mercalli (MM) intensity, which measures the impact of the Earthquakes on the surface of the … Read more
Understanding Earthquakes: A Comprehensive Guide Earthquakes, those sudden and often violent shifts in the Earth’s crust, are a powerful reminder of the dynamic nature of our planet. These seismic events can cause widespread devastation, leaving behind shattered landscapes, collapsed buildings, and a trail of human suffering. Yet, understanding earthquakes is crucial not only for mitigating … Read more
Tectonic Lakes: A Legacy of Earth’s Shifting Plates The Earth’s surface is a dynamic tapestry, constantly reshaped by the relentless forces of plate tectonics. These movements, driven by the heat within the planet’s core, create a myriad of geological features, including mountains, volcanoes, and, importantly, lakes. Tectonic lakes, formed by the direct influence of tectonic … Read more
The Earth’s Fury: A Look at Earthquakes and Volcanoes The Earth, our seemingly stable home, is a dynamic and restless planet. Beneath its surface, immense forces are constantly at play, shaping landscapes and unleashing powerful natural phenomena. Among these, earthquakes and volcanoes stand out as dramatic reminders of the planet’s raw power. These events, while … Read more