Archive | Geography

It is now known that all the inner planets of the sun’s orbit, namely, Mercury, Venus, Earth and Mars, are made up of the same elements. Even then earth is the only planet among them where….

We have just discussed the inner structure and composition of earth which consists of three layers : the top layer called “crust” being about 35 to 60 kilometres thick; the middle layer called “mantle”…

When the rocks at the joint of two plates of lithosphere are sufficiently slippery, then the convec­tion currents just cause the plates to glide gently past one another thereby releasing the internal….

The distances of the universe are so great that ‘kilometre’ is an extremely small and inconvenient unit to express such large distances. The extremely large distances between the various heavenly…

About 250 million years ago, large parts of the continents were covered with swamps (soft, wet land). Thick forests of fern (a beautiful plant with slender leaves) grew in these swamps. These fern….

When the supporting plates of lithosphere made up of rocks crash into one another producing mountains, volcanoes and earthquakes, then a part of the lower lithosphere falls down into magma in…

A black hole is an object with such a strong gravitational field that even light cannot escape from its surface. A black hole may be formed when a massive object (very big object) undergoes …

Stars are the heavenly bodies like the sun that are extremely hot and have light of their own. Every star is a huge mass of hot gases and big flames are coming out of it. Stars are made up of vast…

The sun is a star. It is the star round which the earth and other planets revolve. In a way, we can say that sun is the head of solar family or solar system. Compared with the millions of other stars….

The solar system includes the sun and its nine planets. We shall now describe how the solar system was initially formed. That is, we shall now discuss how the sun and the planets were formed….

In the outward appearance, the earth is a nearly spherical ball with a radius of 6350 kilometres. Internally, the earth consists of three major layers. These are Crust,mantle and core…

The earth is a planet, so it was also formed just like other planets. In the beginning, earth was a huge collection of cold objects called planetesimals. These planetesimals which formed the earth came…

When the earth melted about 800 million years after its formation, its material was reorganized under influence of gravity into three distinct layer of different density….

The structure and functioning of biosphere is similar to that of an ecosystem. The biosphere consists of a non-living environment and a living biological community. So, a biosphere has two main components…

In India the long distance routes are con­nected by railways whereas shorter distances are connected by road due…

Though the destructive activities like earthquakes and volcanoes take place in the Lithosphere, but it also performs many useful functions. Some of the important functions of Lithosphere are given…