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

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Presentation on theme: "Unit 7 – Resources and the Environment (Chp. 25, 26, & 27)"— Presentation transcript:

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

2 Earth’s Resources Distributed 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 Non-Renewable: Fossil fuels
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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