1. Energy Recourses Nearly all the Earth’s energy come from the sun
Traditional Energy sources (such as wood)
Fossil Fuel (coal, oil, gas)
Alternative Energy sources (nuclear
Wind, solar, water, geothermal)
Conservation of Energy resources

2. Traditional sources
Wood- primary source of energy for much of the world.
Field Crops-burning residue of the crops
Fecal material- used where wood and other materials are scarce.
Peat-sponge material from bottom of bogs

3. Fossil Fuels- coal Nonrenewable energy
Coal-compressed organic matter. Different carbon concentration, different burning temps.
Used in electric power plants
Releases carbon, sulfur and nitrogen oxide.

4. Fossil Fuel -oil Petroleum- Means Rock Oil Shallow crude oil deposits
Often seeps up through
cracks or faults
Deposited from organisms
thousands of years ago at
bottom of rivers and seas.

5. Fossil Fuel- Gas

6. Alternative Energy Resources
Solar energy
Hydro electric Energy
Geothermal Energy
Wind Energy
Nuclear Energy
Bio Mass

7. Solar Energy
Passive solar heating- capture sunlight and convert it to heat
Concrete, brick, stone tile
Active Solar heating- use of solar panels, fans, pumps
Photovoltaic cells- sun hits and releases electrons which is stored in electric cells

8. Hydroelectric Energy Falling water turns turbines Hover Dam
Niagra Falls
Provides 20% of the worlds electricity
Non-polluting, recreational activities, flood control, drinking water
Energy from Waves.
May disturb coastal eco systems

9. Geothermal Energy Originates from the earth’s interior.
Geyser-Old Faithful
Water trapped under ground is heated by earths interior
Used in power plants to produce electricity
Advantages- abundant and reliable energy.
Can cause air pollution and clog pipes with minerals
Disadvantages- abundant only where it naturally exists.

10. Wind Energy Wind turbines
Converts mechanical energy from the wind to electrical energy
Nonpoluting
Constant supply
Disadvantages
Noisy
Need constant supply of wind.

11. Nuclear Energy
Nuclear fission- atoms are split into smaller atoms and gives off electrons.
Does not give off greenhouse gasses
Disadvantages
High operating cost
Disposal of nuclear waist
Public concern for safety
TMI, Chernobyl Urcraine
Japan’s nuclear plant