Natural resource, such as coal, oil, or natural gas, that takes millions of years to form naturally and therefore cannot be replaced once it is consumed; Links to sites with facts and information about energy, energy sources and energy pioneers.25 Sep 2009 Energy is used for heating, cooking, transportation and manufacturing. Energy can be generally classified as non - renewable and renewable. Energy sources are of two types: nonrenewable and renewable. Energy sources are considered nonrenewable if they cannot be replenished (made again) in a A non - renewable resource is a natural resource which cannot be produced, grown, generated, or used on a scale which can sustain its consumption rate.
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