Archive For The “Geography” Category

Coal Resources in India

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Most of the coal mined in India comes from the rock formations of two geological ages viz. Lower Gondwana and Tertiary. About 80 per cent of the coal deposits in India is of bituminous type and is of non-coking grade. This is one of the reasons that India has to rely upon imports of coking…

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Western Ghats

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The Western Ghats or SahyÄdri runs north to south along the western edge of the Deccan Plateau, and separates the plateau from a narrow coastal plain along the Arabian Sea. The range starts near the border of Gujarat and Maharashtra, south of the Tapti River, and runs approximately 1600 km through the states of Maharashtra,…

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Black Holes : Key Facts and Types of Black Holes

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Each object has its own gravity which depends on its size and mass. The objects which have highest mass in smallest size would exert most gravity. The ultimate combination of large mass and small size is called a black hole. A black hole exerts such massive gravitational force that its escape velocity is equal or…

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Interesting Facts and Notes on Venus Planet

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Venus is similar to Earth in many ways and is closer in distance to Earth than any other planet, and it has a similar size and composition. Key facts about Venus are as follows: A Venus year is equal to 225 days while a Venus day is equal to 243 days. Thus, a day on…

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Hubble Constant, Doppler Effect, Blue and Red Shift in Galaxies

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The expansion rate of the universe is called the Hubble Constant in honor of Edwin Hubble (1889–1953). Currently the best measured value of the Hubble Constant is about 73 kilometers per second per megaparsec. This implies that if a location in space is one million parsecs from another location, then in the absence of any…

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Interesting Facts About Mercury Planet

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At 58 million kilometers distance, Mercury is closest planet to Sun.  Due this much proximity, mercury’s orbit is very much stretched into a long elliptical shape. Other important facts about mercury are as follows: Mercury takes 88 Earth days to complete one revolution around sun, however, it takes 59 Earth days to complete one rotation….

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Key Facts about Universe

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The universe is all of space, time, matter, and energy that exist. Universe is not just space, but space is just the framework or the scaffolding in which the universe exists. As Space and time are intimately connected in a four-dimensional fabric called space-time. Contents Age of Universe Size of Universe Cosmic Horizon Structure of…

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Planets and Planetary Rings

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A planet is an object which is not a star {i.e. no nuclear fusion takes place in it} and that orbits around a star and is mostly round because its own gravitational pull has shaped it into more or less a sphere. As per current scientific classification, the planets must satisfy three basic criteria as…

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Demographic Dividend, Longevity Dividend and Zero Population Growth

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India is a nation of young people – out of a population of above 1.1 billion, 672 million people are in the age-group 15 to 59 years, – which is usually treated as the “working age populationâ€. A few years back, it was proposed that India in near future (30 years) will see a sharp…

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Key Facts About Sun and Solar System

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Sun is a star with a diameter of 109 times of earth and a mass of 3.30 lakh times of Earth, roughly accounting for 99.9% of total mass of the Solar system. Sun is mostly made of Hydrogen and Helium and is a main sequence yellow dwarf. It was formed some 4.6 billion years ago…

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Population Pyramids : Meaning and Types

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The age-sex structure of a population refers to the number of females and males in different age groups. An age sex pyramid or population pyramid is used to show the age-sex structure of the population. The shape of the population pyramid reflects the characteristics of the population and also indicates whether the population is experiencing…

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