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Eye is one of our most wonder sense organ in our lives. By the help of eyes we can see our surroundings, they are trees, clouds, rainbows, rivers, ponds, plants, people and birds flying in the blue sky, at night moon and stars and many other things. And it is the sense of sight that helps us to read and write etc. But how the blind persons read or write we will discuss later. So it is important to understand its structure and working.   We see things only when light coming from them enters ours eyes. The eye has a roughly spherical shape. The outer coat of the eye is white. It is tough so that it can protect the interior of the eye from accidents . Its transparent front part is called cornea. Behind the cornea, a dark muscular structure is present called iris. In the iris, there is a small opening called pupil. ·          The size of pupil is controlled by the iris. · ...

                     Wind currents,     Thunderstorms(lighting),         Cyclones and           Earthquakes INTRODUCTION     We will begin with some basic features concerning cyclones, wind currents, thunderstorms and earthquakes. Before we begin, remember that the moving air is called wind. Air moves from the region where the air pressure is high to the region where the pressure is low. The greater the difference in pressure, the faster the air moves. But how is the pressure differences created in nature? Is the difference in temperature involved? Let us see;Yes, because it is important to remember that on heating the air expands and occupies more space. When the same thing occupies more space, it becomes lighter. The warm...