Mary Lindeen - Investigating the Rock Cycle
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- Book:Investigating the Rock Cycle
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- Year:2017
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Rock Cycle
Duke University
be reproduced, stored in a retrieval system, or transmitted in any form or by any
meanselectronic, 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
www.lernerbooks.com.
Investigating the rock cycle / by Mary Lindeen.
pages cm. (Searchlight books. What are Earths cycles?)
Audience: 811.
Audience: Grade 4 to 6.
Includes bibliographical references and index.
ISBN 978-1-4677-8058-2 (lb : alk. paper) ISBN 978-1-4677-8337-8 (pb : alk.
paper) ISBN 978-1-4677-8338-5 (eb pdf)
1. RocksJuvenile literature. 2. Geochemical cyclesJuvenile literature.
I. Title.
QE432.2.L565 2016
552'.06dc23 2015000954
1 VP 7/15/15
CYCLE
CYCLE
Earth. They are at the bottoms
of lakes and oceans. They are in
the soil. They are even in our streets.
Where do all these rocks come from?
formation in Arizona. What are some
other places where you might find rocks?
materials that do not come from plants or animals.
Rocks are usually made up of more than one kind
of mineral.
OFTEN USED IN JEWELRY.
MILLIONS OF YEARS AGO.
created again. This natural process is called the rock
cycle. It has been going on for billions of years.
pressure. These forces destroy rocks. But the rocks
do not go away. They just get broken apart or moved.
Destroyed rocks will become new rocks in different
places. Earth recycles its rocks!
substance by wind, water, or ice. Erosion caused
these arches to form over millions of years.
Gravity pulls rocks down. Rocks crack against other
rocks. Wind and water move pieces of rock.
under Earths surface. Heat makes the rock soft. It
melts and mixes with gases. New rock forms when the
melted rock cools again.
rocks. When the water freezes,
the ice expands. Over time, this
can cause rocks to break apart.
heat together make rocks squish instead of break. The
minerals in the rock get pressed together very tightly.
This changes the minerals. The minerals get stretched
and pulled. They flatten out. Pressure can also push
rocks up. Rocks that were buried get moved to Earths
surface. Then erosion wears them down again.
from below Earths surface.
sedimentary, and metamorphic. Each kind is formed by
the rock cycle. During this cycle, one kind of rock can
change into another. But these changes do not happen
quickly. Change can take millions of years.
and
crystal
formation
rock
pressure
rock
pressure
of rock. But rocks can be categorized in other
ways too. You can group them by shape or
color, for example.
Look at them closely. Divide the rocks into
groups. Make a label for each group. For
instance, one group could be Shiny Rocks and
another could be Dull Rocks. Explain why you
put each rock into its group.
ROCKS
inner layers are hot. They
are hot enough to melt rock.
This melted rock is called magma.
Magma rises toward Earths surface
because of changing pressure inside the
planet. Magma cools and hardens as it rises.
photo is melted rock. What
will happen to this melted
rock after it cools?
magma cools and hardens belowground before it reaches
the surface. This magma fills cracks in Earths crust.
IS MADE OF HARDENED MAGMA.
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