Crawford - Physical Geology (Cliffs Quick Review, 1998).pdf - Geology - Amiga78

Cliffs Quick Revie w

Physical Geolog y

Mark J. Crawford, MS.

Cliffs Quick Revie w

Physical Geolog y

Mark J. Crawford, MS.

Cliffs Quick Review Physical Geology

The Cliffs Notes logo, the names "Cliffs," "Cliffs Notes," and

"Cliffs Quick Review," and the black and yellow diagona l

stripe cover design are all registered trademarks belonging t o

Cliffs Notes, Inc., and may not be used in whole or in part

without written permission .

Acknowledgments

Many thanks to Michele Spence, my hands-on editor at Cliffs Notes . In

addition to her expert editing, I appreciate her flexibility, patience, and

always delicately worded queries .

Cover photograph by John Stuart/The Image Ban k

FIRST EDITION

Printed in U.S.A.

ISBN 0-8220-5335-7

The mysteries of the earth have fascinated the human race fo r

thousands of years . Its restlessness has transformed landscapes ,

blackened skies, and buried cities . Our way of life is dependent on

the geologic resources that we take from mines, quarries, and wells .

Expanding our knowledge of our planet, and learning the best ways

to use its resources, is critical to the welfare of our ever-expanding

population .

The dynamics of the earth are hard to quantify because what ca n

be seen, and physically tested, is limited to the rocks on its surface o r

taken from drill holes in the crust —a very small part of the planet !

The interpretation of what these rocks mean—how they relate to eac h

other and how they compare to rocks seen forming today—and th e

use of new imaging techniques that can explore the subsurface giv e

us our modern view of geology.

More now than ever before our knowledge of geology, geo-

physics, and other sciences is being directed toward healing the envi -

ronmental damage that has been done to the earth's surface an d

groundwater . The field of hydrogeology has grown immensely in th e

past twenty years in response to our need for clean water supplies .

Hydrogeologists explore the complexities of groundwater, how it

becomes contaminated, and how to make it clean again .

Today, as in centuries past, the ideas of academic and profes-

sional geologists around the world continue to change . Technologi c

improvements expand the limits of what kind of research can be done .

For example, the early theories of continental drift have now been

proven, and movements of continental plates can be measured i n

centimeters .

Despite the incredible advances in knowledge and technology

that have made geology one of the most exciting fields, the earth i s

still startling, surprising, and mysterious . Many more discoveries

with worldwide impacts lie ahead .

Crawford - Physical Geology (Cliffs Quick Review, 1998).pdf

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