Mineral Resources:


    1.    Discuss characteristics that gems have that make them different from and more valuable than other minerals.

    2.    List the conditions necessary for a mineral to be classified as an ore.

    3.    Distinguish between renewable and nonrenewable resources.




We have already discussed Earth's cycles of building, decay and recycling as the foundation for our closed renewable system.  It is safe to say that for the Earth that all her resources are renewable.  For us as humans, though, this is not the case.  We cannot view ourselves in the same light as a 3.5 billion year old planet that will probably be around for a couple of billion years more.  For us not all resources can be considered renewable.

A renewable resource is one that can be replaced by nature at near its rate of removal.

(www.chania.teiher.gr/ape_Old/ Private/Images/MAIN.jpg)

A nonrenewable resource is one that exists in a fixed amount or is used up faster than it can be replaced.

Coal Plant: Courtesy of http://tqd.advanced.org/2763/Electricity/Generating/Nonrenewable.html





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