changes in earth and sky

Stars - A star is a dense cloud of hydrogen and helium gas contracting under its own gravitational pull. In all the stars hydrogen atoms are continuously converted into helium atoms and this process is accompanied by a large amount of energy. This energy is radiated in the form of heat and light. T..

In an Earth environment, electromagnetic waves propagate in ways that depend not only on their own properties but also on those of the environment itself. Since the various methods of propagation depend largely on frequency therefore the complete electromagnetic spectrum is now shown for..

The Shelley describes the powerful effect of the west wind in the sky. The west wind brakes away the "Clouds" like earth's decaying leaves from the boughs of Heaven. After being plucked, these assume the fierce posture of black rain and hail. These rain clouds are compared to t..

The second planet from the sun is Venus. Venus is almost the same size as the earth, but it is surrounded by thick clouds of hot, poisonous gases. The surface of Venus is generally plain, dotted with mountains, valleys, craters and volcanoes, which may or may not be extinct. Venus It is t..

The solar system consists of sun, the nine planets and their satellites and thousands of other smaller heavenly bodies such as asteroids, comets and meteors. The sun is a star of intermediate size and luminosity. The sun appears to be larger and brighter than other stars because it is neare..

Air around earth is not uniform throughout the atmosphere. The density of air is gradually reduced with altitude. Although atmosphere is spread to 200 km around earth, the oxygen content beyond 5 km above surface of earth hardly supports any life. The composition of a..

If the change in velocity in equal intervals of time is always the same, then the object is said to be moving with uniform acceleration. Example: A body falling from a height towards the surface of the earth..

The basis of life on earth is atmospheric cover on earth and natural cycles like carbon, oxygen, nitrogen and hydrological cycles. Atmosphere is evolved in its present form due to sunlight and rotation of earth on its axis. Many environmental changes ..

We have learnt that a force changes or tends to change the state of rest, speed or direction of motion of an object, i.e., the force produces an acceleration. In this chapter, we are going to identify one of the forces which produces acceleration in all objects on the surface of..

We have learnt that a force changes or tends to change the state of rest, speed or direction of motion of an object, i.e., force produces an acceleration. In this chapter, we are going to identify one of the forces which produces acceleration in all objects on the surface of the..