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An asteroid or comet will inevitably strike the Earth some day, and potentially cause great destruction. This volume considers hazards due to collisions with cosmic objects, particularly in light of recent investigations of impacts by the authors. Each chapter, written by an expert, contains an overview of an aspect and new findings in the field. Coverage describes and numerically estimates the main hazardous effects.
In 1993, the U.S. Department of Defense declassified information dealing with frequent explosions in the upper atmosphere caused by meteoric impact. It is estimated that impacts have occurred of a magnitude equivalent to the atomic bomb detonated at Hiroshima. Not all such space voyagers meet their end in the atmosphere, however; huge craters attest to the bombardment of earth over millions of years, and a major impact may have resulted in the extinction of dinosaurs. An impact in Siberia near the beginning of this century proves that such events are not confined to geologic time. Hazards Due to Comets and Asteroids marks a significant step in the attempt to come to grips with the threats po...
Praise for the previous edition: "Editors' Choice Reference Source"—Booklist "Best Reference Source"—Library Journal "Runner-up, General Nonfiction category"—Green Book Festival "Top 40 Reference Titles"—Pennsylvania School Librarians Association "A worthwhile reference for high school students and the general public."—Library Journal "...interesting and helpful...will help readers gain an understanding of major concepts, terms, and events in modern pollution studies. Recommended."—Choice "Definitive yet accessible...notable for reliable information on a topic of interest to both undergraduate and lay audiences, merits high recommendation for high-school, public, and academic lib...
Over fifty of the most fascinating accounts of history’s greatest unsolved mysteries. Did werewolves roam the countryside of fifteenth century France? What exactly is El Chupacabra, a creature whose name translates to “The Goat Sucker” in English? What phantoms and apparitions drift the halls of Borley Rectory, earning it the nickname of “The Most Haunted House in England”? Featuring maps, callouts, and facts that locate these mysterious happenings, Strange is a groundbreaking book and the first of its kind. In this riveting account of history’s most baffling mysteries, two of the world’s leading authorities on the supernatural, writer Colin Wilson and his son, Damon, search fo...
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Leading intelligence experts Mark M. Lowenthal and Robert M. Clark bring together an all new, groundbreaking title. The Five Disciplines of Intelligence Collection describes, in non-technical terms, the definition, history, process, management, and future trends of each intelligence collection source (INT). Authoritative and non-polemical, this book is the perfect teaching tool for classes addressing various types of collection. Chapter authors are past or current senior practitioners of the INT they discuss, providing expert assessment of ways particular types of collection fit within the larger context of the U.S. Intelligence Community. This volume shows all-source analysts a full picture of how to better task and collaborate with their collection partners, and gives intelligence collectors an appreciation of what happens beyond their "stovepipes," as well as a clear assessment of the capabilities and limitations of INT collection.