SCIENCE BLOG – COAL AND PETROLEUM INTRODUCTION  Here about some exhaustible natural resource like natural gas, coal and petroleum will be discussed, which are also called non-renewable sources of energy .This is because when all the natural gas coal and petroleum present under the earth will get used up, no more supply of these will be available in the near future.   Natural…

Characteristics of matter INTRODUCTION: Substances undergo a wide variety of changes. Many changes take place in nature, for example, the change of weather, the change of a plant into a tree, the formation of cloud, the change of a child into an adult etc,  which  terms as characteristics of matter. Some of these changes are beneficial to…