Question

how dose a substance become a resources ?

Answer 1

A substance becomes a resource when it become economicaly feasible, culturaly acceptable, technology accessible

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Answer 2

Resource: Anything which has some utility for us is called a resource. Some resources have economic value, while some do not. For example; milk has economic value, but a beautiful landscape has no economic value. But both are important because both satisfy some human needs.

            Time and technology are two important factors which can change a substance into resources. For example; petroleum was not a resource before people learnt to use it.