One day, the hermit came as usual to the court. He asked the King, “O King! Where are the fruits I gave you? What did you do with them?” The King replied, “All the fruits have been kept safely in the royal treasury.” The hermit said, “They must have got rotten by now.” The King […]
Once, a ship got wrecked in a storm. Only two friends survived and swam to an island. They decided to pray to God for help. However, to find out whose prayers were more powerful, they divided the island and stayed on the opposite sides. The first thing that they prayed for was food. Soon, the
Long ago, there lived a King named Vikramaditya who ruled over Ujjain. He was the most famous and fearless of all the rulers of his time. One day, he was presiding over his court as usual when a hermit came there. He offered a fruit to the King. The King was very judicious. He ordered
Once, there was a poor Brahmin. He went from house-to-house begging for food in tattered clothes. On seeing his clothes, people shooed him away thinking him to be a beggar. Now, one day, a rich man gave him some new clothes. Wearing those new clothes, he went to beg as before. And to his surprise,
The word hydro means water and power means energy, hence hydropower is power generated by water. The main components of a hydropower plant are: water reservoir, turbine blades and generator. Water from height is made to fall through pipes on turbine blades. The blades then move and turn the generator. And the generator generates electricity.
Once, a boy was carrying some wood. While passing a forest, he a saw a hungry old man. Saddened that he couldn’t help the old man, the boy resumed his journey. Further on, he saw a thirsty deer. Not having any water to give, the dejected boy went ahead. Later, he came across a man
Long ago, in the jungle, lived a pheasant. One day, he spat a seed which grew into a small sapling. The sapling grew into a tree, and bore fruits, which the pheasant ate. Then, the tree grew bigger, and the pheasant couldn’t reach the fruits, at that time, a rabbit came there and said, “Neither
Biomass is biological or organic material. The common biomass materials are the remains of dead plants and animals, animal dung and kitchen waste. The biomass contains energy absorbed by the Sun which can be harnessed. The steps are: firstly, organic waste is collected in a biogas digester, where bacteria decompose the matter and produce biogas
Once, a king was taking a tour of his kingdom with his minister. As he passed by a shop, he said to his minister, “I do not get good vibes from this shop.” The minister was surprised. So, he went inside the shop in disguise. He asked the shopkeeper, “How is your business?” The shopkeeper,
Moving wind has an enormous amount of energy in it. Energy produced by moving air can be used and converted into electricity. Wind mills or wind turbines are used for converted wind energy into electrical energy. These turbines are long tubular towers that have rotating blades at the top. The blades are turned when wind
Renewable Energy Sources: Renewable energy is the energy that can be replenished. Some of the renewable energy sources are solar energy, wind energy, geothermal (Earth’s natural hot spots) energy and biomass energy. These resources can be utilised to generate electricity. The energy produced by these sources is also termed as non-conventional energy. These resources are
Pollution means an undesirable change in the environment. The word pollution is derived from a Latin word pollure, meaning making unclean. There are two types of pollutants: natural pollutants (volcanic ash, forest fire) and man-made pollutants (trash or runoff produced by factories, automobiles, etc). Pollution is classified into: air, water and soil pollution.
Greenhouse effect is the naturally occurring heating of the Earth’s surface. The sun’s radiation enters the Earth’s surface; 1/4th is reflected by clouds and rest falls on the Earth. The surface re-emits the heat in form of infrared radiations. Some infrared radiations are absorbed by atmospheric gases or greenhouse gases (CO2, CH4 etc.). These gases
Ozone is a gas present in the upper part of the stratosphere. The ozone layer is a belt of ozone gas, which absorbs about 98% of the devastating ultraviolet (UV) radiation. It absorbs these rays like a sponge. There exists a balance between conversion of oxygen to ozone and ozone to oxygen in the stratosphere.
Environment is everything that surrounds a living organism and affects it during its lifetime. It is a sum of physical, biological and chemical factors present on the Earth. Environment can be classified into three broad types: biotic, abiotic and cultural. Biotic factors include biological components of the ecosystem, such as plants, animals, micro-organisms, etc. Abiotic