Listen to the recording and fill in the outline. Natural Resources Natural resources refer to 1 Classification of natural resources: On the basis of 2 , resources can be classified into biotic resources and abiotic resources. Forests, animals, birds, coal are examples of 3 Land, water, air, gold, iron are examples of 4 On the basis of their stage of development, natural resources can be classified into potential resources and 5 Potential resources are those that exist in a region and may be used 6 while 7 are those that have been surveyed and used in present times. On the basis of renewability, natural resources can be classified into 8 and non-renewable resources. Renewable resources are ones that can be 9 while non-renewable resources are formed over very long geological periods and thus cannot be replenished once they get depleted. The fundamental problem to be solved is 10