Earth's resources

 where does the clothes come from? where does the gus come from? where does the food come from?
  I thought that they are not made but be on the earth before. I'm wrong. some are made by human,and some are produced by the Earth. So what are the Earth's resources?  you will know by reading this blog.
   Resources are commonly divided into two broad categories_ renewable and nonrenewable. Renewable resources can be replenished over relatively short time spans. Example include natural fibers for clothing and tree for lumber. Nonrenewable resources form so slowly that, form a human standpoint, Earth contains fixed supplies. Example include fuels such as oil and coal, and metal such as copper and gold. A rapidly growing world population and the desire for an improved living standard are causing nonrenewable resources to become depleted at an increasing rate.
   Coal, petroleum, and natural gas, the fossil fuels of  our modern economy, are all associated with sedimentary rocks. Coal originates from large quantities of plant remain that assumulate in an oxygen-deficient environment, such as swamp. More than 70 percent of present-day coal usage is for the generation of electricity. Air pollution by the sulfur oxide gases that form from burning burning most types of coal is a significant environment problem.
   Oil and natural gas, which commonly occur together in the pore spaces of some sedimentary rocks, consist of various hydrocarbon compounds(compounds made of hydrogen and carbon mixed together). petroleum formation is associated with the accumulation of sediment in ocean areas that are rich in plants and animal remains that becaome buried and isolated in an oxygen-deficient environment. When conventional petroleum resources are no longer adequate, fuels derived from oil sand and oil shale may become subsititues. Presently, oil sands form the province of Alberta are a sinificant contributor to Canada's oil produce.
 

    Mineral resources are the endowment of useful mineral ultimately available commerially. Resources inlcude already idenfied deposits from which minerals can be extracted profitably, called reserves, as well as know deposits that are not yet economically or technologically recoverable. Deposits inferred to exist but not yet discovered are also considered mineral resources. The term ore is used to denote those useful metallic minerals that can be mined for a profit, as well as some nonmetallic minerals, such as fluorite and sulfur, that contain useful substances.
 




     How long can our remaining resources sustain the rising standard of living in today's countries and still provide for the growing needs of developing regions? How much environmental deterioration are we willing to accept in pursuit of resources? Can alternatives be found? If we want to live longer and longer, we should to understand our resources and their limits.