This reconceptualization of the text Understanding Earth reflects the fundamental changes in the field of physical geology over the past several years.

About the Author

FRANK PRESS has made pioneering contributions to the fields of geophysics, oceanography, lunar and planetary sciences and natural resource exploration. - He has been named most influential scientist in the U.S by U.S.News& World Report surveys three times and is currently with the Washington Advisory Group - RAYMOND SIEVER is an internationally known expert in sedimentary petrology, geo-chemistry, and the evolution of oceans and the atmosphere. he is a long-time memeber of Harvard University's department of earth and Planetary Sciences - JOHN GROTZINGER researches the chemical development of the early oceans and atmosphere and the environmental context of early animal evolution at MIT - THOMAS H.JORDAN is based at the University of Southern California where his specialist topics include the nature of plate-tectonic flow and the question of mantle stratification

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