General Studies 1

Sources to Study the Earth’s Interior Direct Sources Surface Rocks Surface rocks are available at the surface of the Earth. By observing these rocks, we can determine from which element they are composed and at what depth they were formed. … Continue reading →

Similarly, in going westwards, he loses 12 hours when he reaches 180°W. There is thus a total difference of 24 hours or a whole day between the two sides of the 180° meridian.  This is the International Date Line where … Continue reading →

If each town were to keep the time of its meridian, there would be much difference in local time between one town and the other. Travellers going from one end of the country to the other would have to keep … Continue reading →

Latitudes What is it?: The Parallel of Latitudes extends from the Equator to 90 degrees North Pole and 90 degrees South Pole. They are mainly the east-west circles that connect all the locations of the Earth. The distance between two … Continue reading →

Rotation Earth rotates along its axis from west to east. It takes approximately 24 hrs to complete one rotation. Earth rotates in a counter-clockwise direction. Days and nights occur due to rotation of the earth. The circle that divides the … Continue reading →

Evolution of Earth The earth broke off about 4.5 billion years ago with an explosion. It was a burning hot white mass of gas and dust. Over a long period, dust and gas gradually condensed to form solid rock. Such … Continue reading →

Asteroid Belt Asteroids are remnants of planetary formation that failed to coalesce because of the gravitational interference of Jupiter.  They circle the Sun in a zone lying between Mars and Jupiter.  The circular chain of asteroids is called the asteroid … Continue reading →

Planets in Solar System Our Solar System consists of the sun and eight planets (Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune) which are placed in the Milky Way Galaxy. Classification Planets  in Solar System Inner Planets Mercury Mercury is … Continue reading →

Planets Criteria It is in orbit around the Sun It has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape, and It has cleared the neighbourhood around its orbit. … Continue reading →

Basics of Sun Age – 4.6 billion years Diameter – 1.39 million km Temperature –  6000 °C on the surface The surface gravity of the Sun is 274 m/s2 Period of rotation – 25 days 9 hrs. Rotation – counterclockwise … Continue reading →