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Resources, Food, and Population

Resources, Food, and Population. Dr. Charles Ophardt EDU 370. Minerals. A mineral deposit is a volume of rock enriched in one or more materials Minerals that do not require further processing - For example - gemstones, sand, gravel, and salt (halite). Origin of Mineral Deposits.

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Resources, Food, and Population

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  1. Resources, Food, and Population Dr. Charles Ophardt EDU 370

  2. Minerals • A mineral deposit is a volume of rock enriched in one or more materials • Minerals that do not require further processing - For example - gemstones, sand, gravel, and salt (halite).

  3. Origin of Mineral Deposits • Hydrothermal Mineral Deposits • Magmatic Mineral DepositsPegmatites • Sedimentary Mineral DepositsEvaporites • Placer Mineral Deposits - water - gold • Residual Mineral Deposits - erosion - Bauxite

  4. Processed Minerals • Ironat one time 40% hemitite ores used • AluminumAluminum is the third most abundant mineral in the Earth's crust - (NaAlSi3O8, KalSi3O8), but mined as bauxite • Copper3% to less than 1%

  5. Science & Technology • Case StudyExample of how to bring science and technology into a series of lessons.Should more public lands be opened for mining? • Make a project for groups • Assign roles • Give or help find background materials

  6. Energy Resources • Fossil FuelsOilNatural gasCoalOil Shale and Tar Sands • Combustion reactionFuel(CxHy) + O2 --> CO2 + H2O + Energy • Earth at Night

  7. Land • The availability of arable land at world level is less than 0.27 ha per capita, • Deforestation • Biodiversity. The replacement of natural ecosystems, especially tropical forests, for agricultural purposes results in a loss of biodiversity.

  8. Land (II) • The food supply worldwide is increasingly dependent on stocks of fossil energy, in the form of fertilizers, pesticides, irrigation and machinery. I.e. technology

  9. Water • Water supply. • Irrigation • Worldwide about 69% of the fresh water withdrawn is for the agricultural sector • Desertification - caused by over grazing, loss of cover vegetation

  10. Food and Energy • Energy - Food Chain Pyramid • Food Supply - Eat grain rather than Meat • Feeding the World

  11. Food and Energy • TABLE 7 Equivalent feeding values of corn per kg animal product in the United States (USDA, 1990). • Animal product (1 kg) Corn feeding value (kg) • Milk 0.86 • Egg 3.2 • Broiler 2.4 • Pig 5.7 • Beef 12.6

  12. References • Prof. Stephen A. Nelson Tulane Universityhttp://www.tulane.edu/~sanelson/geol111/matenergy.htm • FOOD, LAND, POPULATION and the U.S. ECONOMY by David Pimentel Cornell University and Mario Giampietro Isiituto Nazionale dell; Nutrizione, Rome http://dieoff.org/page55.htm

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