Give two examples of substances which become a resource with the realisation of its utility?
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Explanation:
Refers to the attachment.
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Time: Time is an important factor in making a substance resource. Resources are developed according to the needs of the people. The needs of people can differ from time to time. This change in needs leads to discoveries and inventions, making substance into resources. For example: Wind was just a substance a few years ago. Now it is an important resource for generating energy. The change in times has changed the demands for energy, which in turn has motivated people to find newer ways of generating energy, thus turning erstwhile substances into resources.
Technology: Unless the use of a substance is determined by inventions and innovation by means of technology, it does not become a resource. For example: when the technology of hydroelectricity was invented, it made the rivers a resource for generating electricity
Example:Petroleum was not a resource before people learnt to use it.