What are Corals and Coral Reefs? Coral or coral polyps are lime secreting small marine invertebrates. Their dead bodies result in built up of coral reefs. They live in large colonies. When these corals die, their skeleton accumulate on one site. The continued accumulation and compaction of these skeletons leads to the formation of coral … Read more
India is a large and diverse country. Most of its diversity is contributed by immigration. The Mobility Transition Model in India has great relevance. It has one of the oldest civilization in the world. India have not found any evidence of primitive men like in Africa and Europe. Therefore, it can be said that most … Read more
Wilbur Zelinsky propounded the mobility transition model of migration in 1971. He analyzed the migration behavior of people in correspondence with Demographic Transition Model. Previous models like Ravenstein’s Laws, Lee’s Intervening Obstacles and Stouffer’s Intervening Opportunities etc. only analyzed process of migration as a result of constant pull and push between places. Whereas, Zelinsky’s model … Read more
Human population growth is dependent on many social, economic and political factors. Warren Thompson (1929) and Frank Notestein (1945) proposed Demographic Transition Model after studying these factors and their effect on population growth in Europe, Australia and North America. Basic Idea behind Demographic Transition Theory Basically, demographic transition model explains the trajectory of population growth … Read more
Criticism of Von Thunen Model is based on its unidimensional character which is based in a medieval European setting. In Europe, the cropping intensity declines away from North-Western Europe. Similarly, the land-use zones are elongated along the cross-continental railways. The cropping intensity declines as one moves away from these modes of rapid transport. Due to … Read more