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There are various methods of categorizing natural resources, these include source of origin, stage of development, and by their renewability. These classifications are described below. On the basis of origin, resources may be divided into:•Biotic – Biotic resources are obtained from the biosphere(living and organic material), such as forestsand animals, and the materials that can be obtained from them. Fossil fuelssuch as coaland petroleumare also included in this category because they are formed from decayed organic matter.•Abiotic – Abiotic resources are those that come from non-living, non-organic material. Examples of abiotic resources include land, fresh water, airand heavy metals including oressuch as gold, iron, copper, silver, etc.Considering their stage of development, natural resources may be referred to in the following ways:•Potential Resources– Potential resources are those that exist in a region and may be used in the future. For example, petroleum