please give me lesson number 3 properties of natural resources standard 7th

Dear Student

Natural resources are materials and component that can be found within the environment. Every man-made product is composed of natural resources . A natural resource may exist as a separate entity such as fresh water, and air, as well as a living organism such as a fish, or it may exist in an alternate form which must be processed to obtain the resource such as metal ores, oil, and most forms of energy.

They can be classified as renewable and non renewable source of energy. 

Natural resources are considered renewable if they can be replenished within a relatively short period of time like forests, wildlife. Non renewable resources must be considered gone forever once used up because they take millions of years to regenerate like coal, petroleum.

Renewable resources can be further classified as exhaustible and non exhaustible resources. The resources which can not be depleted even after continuos use like wind, sun light and water are called non exhaustible resources. The resources which can be depleted by continuos use like forests, wild life etc. are exhaustible resources. 

Regards