What are the two key concepts for this section? What are the reserves of a mineral resource and how can they be expanded? What two factors determine the future supply of a nonrenewable mineral...

What are the two key concepts for this section? What are the reserves of a mineral resource and how can they be expanded? What two factors determine the future supply of a nonrenewable mineral resource? Explain how the supply of a nonrenewable mineral resource can be economically depleted and list the five choices we have when this occurs. What is depletion time and what factors affect it?