Geography

China China ranks first in the world in coal production. Nearly 38 per cent of world’s coal output is from China. All types of coal are found, including anthracite, bituminous coal and lignite. Although coal occurs in every province of China, but its greatest concentration is in Shanxi and Shaanxi (Shansi and Shensi).   USA … Read more

As urban areas develop, changes occur in their landscape. Buildings, roads, and other infrastructure replace open land and vegetation. Surfaces that were once permeable and moist become impermeable and dry. These changes cause urban regions to become warmer than their rural surroundings, forming an “island” of higher temperatures in the landscape. Heat islands occur on … Read more

Boosting Rural Development through Agri-infrastructure Most of the perishable items are produced in the villages which remain confined to these due to the absence of road networks. The existing road and rail facilities are inadequate. Most of the areas which produce good quality fruits are still inaccessible. This coupled with the rough terrain of the … Read more

Dams and flood control The efficiency of dams to withhold floods has always been put to question. Critics have also termed dams as harbinger of floods claiming that the essential scientific assessment for consistent release of water to avoid build up is rarely done. Absence of a standard operating procedure for releasing water from the … Read more

EROSIONAL LANDFORMS Cirque Cirques are the most common of landforms in glaciated mountains. They are deep, long and wide troughs or basins with very steep concave to vertically dropping high walls at its head as well as sides. A lake of water can be seen quite often within the cirques after the glacier disappears. Such … Read more

urban settlements are classified on various bases. However, classification based on size and function are most common. Let us discuss them one by one Classification based on Population Size According to population size, census of India classifies urban centres into six classes. Classwise urban settlements and their population Class                              Population Class I                            1,00,000 and above … Read more

The population structure associated with a DD is a natural stage of the demographic transition, which is when countries change from having high birth and death rates to having low birth and death rates. The first stage of the transition is typically a fall in child mortality due to improvements in healthcare, nutrition and overall … Read more

Major irrigation projects The Lower Bhavani Project  The Lower Bhavani project was one of the British achievements in the Tamil country. For the preliminary works regarding the Lower Bhavani project that government appointed Sir. Charles Innes in 1906 as the Special Revenue Officer instructing him to report on the various aspects of the scheme. After … Read more

A fault is a fracture in the earth’s crust due to tension force. It can also occur due tocompression in hard and brittle rocks. When there is tension the crust ruptures. One block is thrown upwards and the otherdownwards. The upthrown block is called Horst while the downthrown block is calledGraben. The line along which … Read more

Isostacy:It is the state of gravitational equilibrium between Earth’s crust and mantle such that the crust”floats” at an elevation that depends on its thickness and density.Related to differences between oceanic crust, continental crust, and the mantle, is the principleof isostasy. In simplest terms, the lithosphere is “floating” on the denser, deformable,asthenosphere below. The addition of … Read more