Microorganisms: Friend and Foe
Living organisms which cannot be seen without using microscope, are called microogranisms...Materials: Metals and Non-Metals
Everything around us is called material. For example tree, water, gas, table, chair, iron, comput...Coal and Petroleum
Natural Resources can be divided into two types in the light of their availability. These two typ...Combustion and Flame
Combustion: A chemical process in which a substance reacts with oxygen to give o...Conservation of Plants and Animals
Conservation is the protection of species from their extinction. Conserv...