physical_geography

Jun 27th, 2015
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A galaxy starts to form by accumulation of hydrogen gas in the form of a very large cloud called nebula. Eventually, growing nebula develops localised clumps of gas. These clumps continue to grow into even denser gaseous bodies, giving rise to formation of stars.

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GS NotesGEOGRAPHYThe term geography was first coined by Eratosthenese, a Greek scholar (276-194 BC.)Physical GeographyA galaxy starts to form by accumulation of hydrogen gas in the form of a very large cloud called nebula.Eventually, growing nebula develops localised clumps of gas. These clumps continue to grow into evendenser gaseous bodies, giving rise to formation of stars.A light year is a measure of distance and not of time. Light travels at a speed of 300,000 km/second. distancesthe light will travel in one year is taken to be one light year. This equals to 9.4611012 km.The mean distance between the sun and the earth is 149,598,000 km. In terms of light years, it is 8.311minutes of a year.Out of the nine planets, mercury, venus, earth and mars are called as the inner planets as they lie betweenthe sun and the belt of asteroids the other five planets are called the outer planets.Alternatively, the first four are called Terrestrial, meaning earth-like as they are made up of rock and metals,and have relatively high densities. The rest five are called Jovian or Gas Giant planets. Jovian means jupiterlike. Most of them are much larger than the terrestrial planets and have thick atmosphere, mostly of heliumand hydrogen.During the cooling of the earth, gases and water vapour were released from the interior solid earth. Thisstarted the evolution of the present atmosphere. The early atmosphere largely contained water vapour,nitrogen, carbon dioxide, methan

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