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
Once, a kind millionaire was approached by three beggars. The first beggar demanded, “Sir! Please give me five rupees.” The millionaire was taken aback at the man’s impudence. He only gave him two rupees. The second beggar said, “Sir! I have not eaten properly for so many days. Please help me.” “How much do you
Types of Soil: Soil is classified according to colour, size and texture of soil particles. There are mainly four types of soil:♦ Sandy soil has more sand and no humus.♦ Clayey soil is usually brown in colour. It has more clay than sand particles.♦ Loamy soil is a mixture of clayey soil, sandy soil and
There were two good friends: a saint and a rich man. One day, the rich man invited the saint to his house. He made beautiful arrangements for him. The saint was very happy. But a man who was jealous of their friendship said to the saint, “See, your friend has intentionally made this arrangement to
Once, there was a boy named George. He was very fond of eating sweets. Not a moment went by when he was not seen eating sweets. One day, his aunt gave him a box of sweets. But his mother kept them at a safe place so he would not overeat. She gave him some sweets
Soil: The uppermost thin layer covering the Earth’s surface is called soil. Soil is composed of rock particles, mineral fragments, remains of the dead, living things, water and air. The soil has five layers: humus, topsoil, subsoil, rock fragments and bedrock. There are four basic types of soil: sand, loamy, silt and clayey. Soil Profile:
A long time ago, there was a very hard-working farmer named Frank. He had three sons: Gerry, Tom and Brad. All three though strong were lazy. Frank was worried about his sons and the future of his farm. One day, he had an idea. He called his sons and said, “I have hidden a treasure