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Geothermal Energy
Geothermal energy is heatinside the earth.
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What is Geothermal?
Geothermal comes from theGreek words geo(earth) and
therme(heat).
Thus, geothermal energy meansheat inside the earth.
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The Earth Is Made of Layers
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At the center is a coreof iron.
Around that is an outer core of ironand rock so hot the rock
is
melted.The liquid rock is called magma.
The next layer is a mixture of rockand magma called the
mantle.
The shell of the earthwith theoceans and mountains - is
calledthe crust.
The Earth Is Made of Layers
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Heat Inside the Earth
The inside of the earthis very hot.
Sometimes this heatcomes near the surfacein the form of
magma.
We can use this heat towarm our houses andmake electricity.
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How Do We Use Geothermal Energy?
People have used geothermal energy for heatingand bathing for
thousands of years.
Hot springsare pools of water that are warmedby underground
springs, so they are always hot.
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Today, power plantsuse steamfromgeothermal wells tomake
electricity.
The steam is used tospin turbines.
The turbines spinmagnets in coils ofcopper wire to
makeelectricity.
How Do We Use Geothermal Energy?
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Even though geothermalenergy is underground,
there are visiblefeatures on the surface.
These include
volcanoes, hotsprings, and geysers.
Where Can We Find Geothermal Energy?
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A volcano means hot magma is near the surface.
Where Can We Find Geothermal Energy?
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The most active geothermal resources are usually foundwhere
earthquakesand volcanoesare concentrated.
Where Can We Find Geothermal Energy?
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Most geothermal activity occurs in anarea called the Ring of
Fire.
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Most geothermal plants in the United States arelocated in the
western half of the country.
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Geothermal Energy in the United States
Geothermal energy produces only asmall percentage of U.S.
electricity.
Today, it produces about 15 billionkilowatt-hours, or less than
onepercentof the electricityproduced in this country.
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The hot water we use will be replaced by rain.
The heat inside the earth will always be there.
More heat is made every day in the Earthscore.
We wont run out of geothermal energy!
Geothermal Energy is Renewable.
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Geothermal Energy is Clean.
No fuel is burned,so there is no air
pollution.
The steam isturned into water
and put back intothe earth.
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Geothermal energy
is cheapnewpower plants canmake electricity forabout the same
ascoal power plants.
Geothermal Energy is Cheap.
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Geothermal plants dont transport fuel
they sit on topof their fuel source.
Geothermal power plants have been builtin deserts, in the middle
of crops, and inmountain forests!
Geothermal Energy doesnt have to
be transported.
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Discussion Questions
With all the advantages of geothermalpower, why dont we use
geothermal
power more in the United States?
What are some disadvantages to using
geothermal power?
