Consider the following statements-
1. A non-renewable resource (also known as a finite resource) is a resource that does not renew itself at a sufficient rate for sustainable economic extraction in meaningful human timeframes.
2. The original organic material, with the aid of heat and pressure, becomes a fuel such as oil or gas.
3. Fossil fuels (such as coal, petroleum, and natural gas), and certain aquifers are all non-renewable resources.
4. The metals themselves are present in vast amounts in the earth's crust, and are continually concentrated and replenished over millions of years.
5. the extraction of non-renewable resources by humans only occurs where they are concentrated by natural processes (such as heat, pressure, organic activity, weathering and other processes) enough to become economically viable to extract.
6. These processes generally take from tens of thousands to millions of years.
7. As such, localized deposits of metal ores near the surface which can be extracted economically by humans are non-renewable in human time frames, but on a world scale, metal ores as a whole are inexhaustible, because the amount vastly exceeds human demand, on all time frames.
Select the correct answer using the codes given below.
View solution