SHARMA CLASSES BHARATPUR

Air around us Atmosphere:  The envelope of air that surrounds the earth is known as the atmosphere. The atmosphere of Earth is the layer of gases, known collectively as air. Earth's atmosphere stretches from the surface of the planet up to as far as 10,000 kilometres (6,214 miles) above ·           The air becomes thinner and thinner as we go high up from the surface of the earth. ·           The atmosphere is quite active due to the movement of air, with respect to the earth. ·           The processes like cloud formation, thundering, rain etc., occur in the atmosphere. Uses of Air Wind:  When air is in motion, it is called wind. Weathercock:  It shows the direction in which the air is moving at that place. Air:  Air is a mixture of different gases. Air is also present in things which seem to be empty. Properties of air ·          It is colourless i.e., it has no colour and taste. ·          It is transparent i.e., we can see through it. ·          Air occupies space.

  Electricity                   class 6   ·          Electricity is useful form of energy. it play very important role in our daily life it make our work easy. ·          It is needed for functioning of electric equipments like computer refrigerator air conditioner bulb and etc Electric cell :   It is a common source of electric energy for many types of equipment it is used in calculators .remote, toy , camera etc   Advantage of electric cell ·          They are lightweight so they are portable ·          they produce a very small amount of electricity so safe for work ·          they are not very costly ·          they do not contain chemical liquid ·          they give study electric current   Dry cell:  Dry cell is a source of electricity. it convert chemical energy into   electric energy. A dry cell is a very convenient source of electric current A cell consist of an outer covering made up of zinc at the centre of container a carbon rod with a metallic c

SHARMA CLASSES BHARATPUR SOIL Soil is one of the most important natural resources. It is the uppermost layer of earth’s crust which is blackish-brown in colour. Major functions of the soil are: 1.     It supports plant growth by holding the roots firmly and supplying water and nutrients to the plants. 2.     It acts as a natural habitat for many organisms like an earthworm, fungi, bacteria, ants, etc. 3.     It is also essential for agriculture which provides us with food, clothing and shelter for all. 4.     It supplies water and nutrients to plants. Humus Humus is the organic component present in the soil formed by the decomposition of plant materials by microorganisms present in the soil. Humus is the rotting dead matter in the soil. Weathering Weathering is the breaking down or dissolving of rocks and minerals on Earths surface. Water, ice, acids, salt, plants, animals, and changes in temperature are all agents of weathering. Weathering is a very slow process