1. Natural Resources

2. Sources of Energy Nonrenewable Resources
Resources used faster than they can be replaced by natural processes
Provide 93% of energy

3. Sources of Energy Nonrenewable Resources
Fossil Fuels
Form over millions of years
Fuels used today are remains of prehistoric organisms
Decayed remains buried by layers of sediment
Change chemically by extreme pressure and temperature

4. Sources of Energy Nonrenewable Resources
Fossil Fuels
Type of fossil fuel depends on:
Type of organic matter
Temperature and pressure
Length of time buried

5. Sources of Energy Nonrenewable Resources
Fossil Fuels
Coal
Plants growing in prehistoric swamps died
Bacteria, extreme temperature, and pressure acted on remains
Peat (brownish material) formed
Peat changes into harder types of coal

7. Sources of Energy Nonrenewable Resources
Fossil Fuels
Natural Gas and Oil
Formed in process similar to coal
Microscopic marine organisms called plankton died and fell on ocean floor
Covered by sediment
Decomposed by bacteria; acted on by extreme temperature and pressure
Thick liquid oil forms first
Continued temperature and pressure created natural gas

9. Sources of Energy Nonrenewable Resources
Fossil Fuels
Advantages
Easy to transform chemical energy to electric energy
Relatively inexpensive
Easy to transport

10. Sources of Energy Nonrenewable Resources
Fossil Fuels
Disadvantages
Limited supply (nonrenewable)
Habitat disruption
Obtaining fuel disrupts environment
Pollution
Run-off
Burning releases harmful chemicals into air

11. How to Clean Up Oil Spills

12. Sources of Energy Nonrenewable Resources
Nuclear Energy
Energy released from atomic reactions
Nuclear Fission
Process of splitting atoms that releases thermal energy

13. Sources of Energy Nonrenewable Resources
Nuclear Energy
Advantages
Small amount of uranium produces a large amount of energy
Does not pollute air, soil, or water

14. Sources of Energy Nonrenewable Resources
Nuclear Energy
Disadvantages
Limited supply
Must be carefully monitored to avoid radioactive release
Waste materials are radioactive and dangerous

15. Sources of Energy renewable Resources
Resources that can be replaced by natural processes in a relatively short amount of time

16. Sources of Energy renewable Resources
Advantages
Renewable (will not run out)
Produce less pollution
Disadvantages
Can be costly or limited to certain areas

18. Sources of Energy renewable Resources
Solar Energy
Energy from the sun
Solar cells capture light energy and transform in to electrical energy

21. Sources of Energy renewable Resources
Water Energy
Hydroelectric Power
Electricity produced by flowing water
Tidal Power
Water flows across turbines as tide comes in a goes out

23. Sources of Energy renewable Resources
Wind Energy
Wind turbines produce electricity
Wind farms: group of wind turbines that produce electricity

25. Sources of Energy renewable Resources
Geothermal Energy
Thermal energy from earth’s interior
Wells are drilled to reach hot rocks or magma
Thermal energy heats water, makes steam to produce electricity

27. Sources of Energy renewable Resources
biomass Energy
Energy produced by burning organic matter, such as wood, food scraps, and alcohol
Can be converted into fuel for vehicles
Ethanol
Biodiesel

29. biomass Energy Experiment
Which do you guess has more heat energy, vegetable oil or petroleum oil? Write a hypothesis for your prediction.
Copy this table into your notebook. Fill it in as we collect data.
Would vegetable oil be a good substitute for petroleum oil as fuel? Why?
Type of Oil
Temperature of cold water
Temperature after burning
Difference in temperature

30. Sources of Energy Natural Resources
Sustainability
Meeting human needs in ways that ensure future generations also will be able to meet their needs

31. Sources of Energy Natural Resources
Something from earth that living things use to meet needs

32. Sources of Energy Natural Resources
Land Resources
Living space
Natural habitats
Land for buildings, sidewalks, and streets

33. Sources of Energy Natural Resources
Land Resources
Forests and Agriculture
Forests cut down for fuel, paper products, and wood products
Growing crops
Grazing livestock

34. Sources of Energy Natural Resources
Land Resources
Mineral Resources
Ores
Deposits of minerals that are large enough to be mined for profit
EX: halite (salt); silica (glass); copper

35. Sources of Energy Natural Resources
Land Resources
Mineral Resources
Reclamation
Process in which mined land must be recovered with soil and replanted with vegetation

36. Sources of Energy Natural Resources
Land Resources 
Advantages
Widely available
Easily accessed
Crops and trees are renewable

37. Sources of Energy Natural Resources
Land Resources 
Disadvantages
Deforestation
Cutting of large areas of forests for human activities
Pollution
Some (minerals) are nonrenewable

38. Sources of Energy Natural Resources
Air Resources
Needed to survive
Polluted by burning fossil fuels or natural events
Photochemical Smog
Acid Precipitation
Natural Events

39. Sources of Energy Natural Resources
Water Resources
Limited supply of freshwater
Meets many needs—farming, industry, electricity, household activities, transportation, recreation
Can be polluted by fertilizer or industry