Class 9th CBSE

Disaster Management * A disaster is a destructive event that occurs suddenly and involves loss of life and property. * Disaster can be of two, natural and man-made. * Earthquakes, volcanic activity, Tsunamis, flood, cyclones, landslides, avalanches and droughts are natural disasters. * Some of the ma-made disasters are: bomb explosions, terrorism, war or civil ... Read more

Population Size and Distribution * People are producers and consumers of resources. * Population is the point of reference from which all other elements are observed. * A census is an official enumeration of population done periodically. * The Indian Census is the most comprehensive sources of demographic, social and economic data. It provides answer ... Read more

Biodiversity – Natural Vegetation and Wildlife * A plant community that has grown naturally without human aid is called natural vegetation. * Virgin vegetation is natural vegetation that has been left undisturbed by humans for a long time. * Virgin vegetation of purely Indian origin is known as endemic or indigenous species. * Plants that ... Read more

Climate of India * In India, the Tropic of Cancer passes through the central part of the country. * India has both tropical and subtropical climates. * Altitude refers to the height above sea level. * The Himalayas influences the climate of the Indian subcontinent by protecting it from the cold air mass of Central ... Read more

Introduction to Drainage System * A drainage basin is an area drained by a single river system. * The drainage basin works as a funnel, by collecting all the water within the area and channelling it into a waterway. * Himalayan rivers are perennial, whereas Peninsular Rivers are seasonal. * This upland area is known ... Read more

Formation * It has been formed over several geological periods. * According to the theory of Plate Tectonics, the earth’s crust was formed out of seven major and some minor plates. Tectonic plates are classified into:    *  Convergent boundary    *  Divergent boundary    *  Transform boundary * Gondwanaland originally consisted of Asia, Africa, ... Read more