World Geography

The term plate tectonics was first used by Tuzo Wilson. The Plate Tectonics theory was first published by W.J Morgan in 1962. It deals with dynamic movement of earth’s crust by endogenic forces. The theory is based on scientific mapping … Continue reading →

Development The hypothesis of seafloor spreading was put forward by H. Harry Hess in 1960. When oceanic plates diverge, tensional stress causes fractures to occur in the lithosphere. Basaltic magma rises from the fractures and cools on the ocean floor … Continue reading →

Idea The hypothesis of seafloor spreading was put forward by H. Harry Hess in 1960. Basis Theory for Seafloor Spreading Theory Convection Current Theory Put forward by Arthur Holmes in the 1930s. The theory discussed the possibility of convection currents … Continue reading →

Development Continental Drift theory was put forth by Alfred Wegener in 1912. According to Wegener, all the continents formed a single continental mass which is called “Pangaea” and this supercontinent was surrounded by a mega ocean called “Panthalassa ”. Later … Continue reading →

Definition Violent shaking of earth due to release of energy , generating seismic waves in all direction. Earthquake Waves Body Waves: Move in all direction travelling through the body of the earth P Waves: Move faster. First to report on … Continue reading →

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 →