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Unit 7 – Resources and the Environment ( Chp . 25, 26, & 27)

Unit 7 – Resources and the Environment ( Chp . 25, 26, & 27) . Review for TEST. Earth’s Resources Distributed Unevenly . Air Water Land Organisms Rocks Minerals Nutrients Geochemical cycles. Water. Liquid Wide range of temperatures High heat-storage capacity

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Unit 7 – Resources and the Environment ( Chp . 25, 26, & 27)

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  1. Unit 7 – Resources and the Environment (Chp. 25, 26, & 27) Review for TEST

  2. Earth’s ResourcesDistributed Unevenly • Air • Water • Land • Organisms • Rocks • Minerals • Nutrients • Geochemical cycles

  3. Water • Liquid • Wide range of temperatures • High heat-storage capacity • Dissolves many substances • Expands when it freezes

  4. Natural Resources Renewable: • living things • surface water • Groundwater • fertile soil • Air • solar energy • elements that cycle (carbon, nitrogen) • Replaced through natural processes at same rate as being used Non-Renewable: • Fossil fuels • Elements (gold, copper, silver) • Fixed amounts – replaceable through process that takes hundreds of millions of years

  5. Land Resources • Topsoil • Rocks • Minerals • Space for humans to use: • Housing • Agriculture • Roadways – use aggregates to build first layer. A mixture of gravel, sand, crushed stone

  6. How humans harm resources • Poor farming practices • Air pollution by activities that disrupt the balance of geochemical cycles • Burning of fossil fuels (releases sulfur) • Mining – ore can be mined for a profit

  7. Energy Resources • Sun is the primary energy resource • Biomass –wood and field crop burned to use as fuel • Coal • Natural gas • petroleum

  8. Air Resources • The most important component of air is: • Oxygen 21% • The oxygen in Earth’s atmosphere was supplied slowly over time by photosynthetic organisms • Geochemical cycles: • Water cycle • Carbon cycle • Hydrogen cycle

  9. Alternative Energy Resources • Solar energy • Hydroelectric power – energy from falling water • Geothermal energy • Nuclear energy • Biomass energy

  10. Word Equations Decreased demand for resources = reducing + reusing + recycling Biogas= methane + carbon dioxide Peat= remains of organisms + swamp + anaerobic conditions Gasohol = alcohol + gasoline Coal= peat + high temperature and pressure Topsoil= decaying organic matter + eroded rock + minerals + nutrients + oxygen + water

  11. Conservation / Population • Sustainable energy – will ensure current and future energy needs • Population will reach the carrying capacity and stop growing • Human Global Impact • Acid precipitation • Ozone depletion – ground level ozone is a major component of smog • Global warming

  12. GOOD LUCK! Test tomorrow

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