Matt Doeden - Finding Out about Geothermal Energy: What Are Energy Sources?
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- Book:Finding Out about Geothermal Energy: What Are Energy Sources?
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reproduced, stored in a retrieval system, or transmitted in any form or by any means
electronic, mechanical, photocopying, recording, or otherwisewithout the prior written
permission of Lerner Publishing Group, Inc., except for the inclusion of brief quotations in
an acknowledged review.
A division of Lerner Publishing Group, Inc.
241 First Avenue North
Minneapolis, MN 55401 USA
pages cm. (Searchlight booksWhat are energy sources?)
Includes index.
ISBN 9781467736589 (lib. bdg. : alk. paper)
ISBN 9781467746380 (eBook)
1. Geothermal engineeringJuvenile literature. 2. Geothermal resourcesJuvenile
TJ280.7.D66 2015
621.44dc23
1 BP 7/15/14
GEOTHERMAL
ENERGY?
GEOTHERMAL ENERGY
GEOTHERMAL ENERGY
GEOTHERMAL ENERGY?
hundreds or thousands
of feet beneath Earths
surface. What would you
find? The ground might
seem cool as you dig a few
feet down. But that soon
changes. You dig deeper, and
it gets warmer. And warmer.
And warmer! Soon its hotter
than you can stand.
first dig into it. Does it stay
cool as you dig deeper?
farther down you go, the hotter it gets. The heat trapped
deep inside Earth is called geothermal energy. Geo means
earth. Thermal means heat.
waters in Yellowstone
National Park.
energy has two
main uses. It can
heat buildings. Or
it can be used to
make electricity.
We usually just
have to dig a little
to reach it.
world, you can swim
in water heated by
geothermal energy.
can reach 9,000F (5,000C). That is hot enough to melt
rock! But where does all that heat come from?
LAYER IS THE INNER CORE.
That happened about billion years ago. Earth formed
as dust and gas collapsed together. The collapse created
a lot of heat.
Earth was formed plays
an important role in
geothermal energy today.
out of a volcano, it is
called lava.
was so hot that rocks melted into a liquid called magma.
Some of that heat remains inside Earth to this day.
About percent of the cores heat is left over from
when Earth formed.
radioactive decay. This is the process by which some
materials decay, or break down, over time. Atoms are
the basic building blocks of matter. Some types of atoms
are radioactive. They break down. When they do, they
release a lot of energy. This energy becomes heat.
that becomes heat.
up. When pressure gets too high,
water erupts from the surface.
just stay in the core.
The hotter magma is,
the lighter it is. So it
slowly flows outward,
toward the surface. It
carries some of the
cores heat with it.
This keeps everything
underground warm.
When we tap into this
heat, we can get energy.
GEOTHERMAL ENERGY
energy for thousands of years.
In some places, springs hot reach
the surface. These pools
of water are heated by
Earth. People in places such
as ancient China and ancient
Rome used these hot springs
as baths. Some even used the
water to heat their homes.
geothermal energy to bathe. What
was another way that ancient people
used these warm waters?
Iceland has many hot springs. Pipes carry the hot
water into homes. The water gives off its heat and
keeps the homes warm. It is a very easy and cheap
way to stay warm. But most parts of the world are far
from hot springs. Using Earths heat in these places is
a little trickier.
hot springs to homes.
geothermal heat pump.
a spring hot in your
backyard. That means
that youll have to dig to
get at Earths heat. And
many homeowners are
doing just that. They
are putting geothermal
heat pumps (GHPs) into
their homes.
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