Earth’s crust and the interior of the earth: The earth is almost like a sphere. Its radius is about 6,400 kilometres. There is no scope to observe the interior of the earth by piercing the hard external covering. The geologists by observing the characteristics...
The orbit of the earth is an ellipse. Its length is 93,80,51,827 kilometres. The sun is located in the centre or in the focus of the ellipse. Perihelion: In the process of revolution around the sun, the earth on 1st to 3rd January reaches in such a position that the distance between the sun and the earth becomes the lowest. It is about 14 crore 65 lakh 83 thousand 5 hundred kilometres. This...
Everyday the sun rises in the east and sets in the west. This process led many people in the past to think that the sun is moving and the earth is fixed. The sun moves around the earth. But with the advancement of science, this has been proved that the...
The Atlantic slave trade began in 1442 when African captives from the Senegal river were taken to the port of Lagos in southern Portugal and sold as slaves. After the Spanish reached the Americas in 1492, the direction of the trade became trans-Atlantic...
The Europeans had frequented the coasts of West Africa since the fifteenth century and established settlements along the coast in order to facilitate trade, in particular the transatlantic slave trade. There was, however, little interest in driving colonisation...