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
Tectonic lakes are lakes that form in depressions created by tectonic activity. The most common type of tectonic lake is a rift lake, which forms when two tectonic plates move apart and create a rift valley. Other types of tectonic lakes include caldera lakes, which form when a volcano erupts and collapses, and landslide lakes, … Read more
Here is a list of subtopics about earthquakes and VolcanoesVolcanoes: Earthquakes Causes of earthquakes Types of Earthquakes Measuring earthquakes Effects of earthquakes Earthquake prediction Earthquake safety Volcanoes Causes of volcanoes Types of Volcanoes Measuring volcanoes Effects of volcanoes Volcano prediction Volcano safety I hope this helps! Earthquakes and volcanoes are two of the most powerful … Read more