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Chapter 5---Section 3

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Energy cannot be made or destroyed! The two main sources of energy are: The Sun Radioactive atoms in Earths interior

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Energy sources that are used up much faster than can be replaced Fossil fuels Nuclear energy When Fossils Fuels burn: Stored chemical energy is released Releases pollutants into the air

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Oil and Natural Gas: Made from remains of microscopic marine organisms Coal: Formed from remains of ancient plants All contain stored chemical energy that originated from the sun All are formed by heat and pressure

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Comes from the nuclei of unstable atoms Ex. Uranium Advantages- Can be used to generate electricity instead of fossil fuels Doesnt cause air pollution Disadvantages- Uranium is nonrenewable Waste produced is radioactive

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Using water to make electricity Water is a RENEWABLE resource - energy source that is replenished continually Advantage- pollution free Disadvantage- disrupts life cycles of aquatic organisms As long as there is precipitation to keep rivers flowing, energy can be produced

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Are less harmful to people and environment Help to conserve fossil fuels Most are INEXHAUSTIBLE resources -energy resources that cant be used up Include: Solar Energy Geothermal Energy Energy From Oceans Wind

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Is really expensive Collected by: Thermal collectors Use black pipes to collect suns rays Photovoltaic collectors Photo means light / voltaic means electrical Transform light energy directly into electrical energy

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Generated from heat deep inside Earth: Radioactive decay Molten rock or magma Hot springs or geysers

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Oceans are always in motion Inexhaustible source of mechanical energy Does not produce pollution Tidal power plants: Generate electricity as the tide comes in or goes out Limited usage

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Windmills Convert kinetic energy into electrical energy Propeller is the turbine which is connected to generator Advantage Does not produce pollution Disadvantage Produce noise May kill birds

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Reducing the use of energy Turn off lights and unused appliances Close doors or windows to trap heat Use proper insulation Recycling Consolidate trips or passengers to reduce oil usage