Physical phenomena associated with the presence and flow of electric charge is known as electricity.

Resources include the total natural environment as all parts of the Earth are of some use to man. They are actually stocks of nature such as water, soil, minerals, coal, forests, etc. but due to increasing population and technological development, our natural resources are getting polluted and depleted. Pollution is an undesirable change in physical chemical and biological characteristics of soil, water and air. This is harmful for all humans as well as other organisms on the Earth. So there is an immediate need to take proper care and manage the natural resources to sustain them and conserve our environment for sustainable development. There are international laws, organizations, different acts working towards the protection of our environment.