"At its best in synthesizing [current available] information to derive theories about the geological and tectonic histories of the planet ."—Science Books & Films "This book is another in the excellent University of Arizona Space Science Series, each of which is based on a conference. . . .but goes far beyond a conference proceedings to present a comprehensive summary of current knowledge. . . .I recommend this book as a valuable compendium of current knowledge."—Pageoph "This collection will be a most valuable addition to any research library."—Choice