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TITLE:
Renewable Energy Sources

active solar energy - solar collectors absorb and transform the sun's energy into thermal energy
passive solar energy - buildings can be designed to absorb the sun's energy
photovoltaic cells - PV cells convert light energy into electrical energy
geothermal energy - heat from the earth's core
solar power
waves - buoys floating in the sea can convert the energy of motion of waves into electrical energy
wind - turbines turn the wind's energy into electrical energy
tides - as the tide rises and falls water turns a turbine and generates electricity
biomass - plants retain the sun's energy producing biomass through photosynthesis

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TITLE:
Energy Sources

waves and tides - electrical power can be generated from the motion of waves or from water stored behind a tidal barage
natural gas - mostly methane and the result of tiny animals and plants decaying under sand and mud
oil - turned into many products and fuels such as petrol & diesel
food - eaten by people & animals for energy
hydroelectric power - water released from a dam forces a turbine to turn and generate electricity
wind - for centuries used to power machines such as grinding stones, today used to generate electricity
solar energy - panels can absorb the sun's energy for heating water or air
nuclear power - controlled atomic reactions release heat that can turn water into steam to power a turbine for electricity generation
geothermal energy - heat from the earth's core can be transfered to water and pumped above ground
coal - formed millions of years ago when plant life was compressed under layers of mud