Frozen Earth: The Once and Future Story of Ice Ages, With a New Preface Format:Paperback com to start your geocaching

com to start your geocaching adventure

Durable material: Made of corrosion- and wear-resistant alloy

it allows accurate diameter measurements from a distance

only became possible after significant advances in such technologies as X-ray diffraction and gel electrophoresis

or 6 megapixels in full color

Frozen Earth: The Once and Future Story of Ice Ages, With a New Preface Format:Paperback com to start your geocachingIn this engrossing and accessible book, Doug Macdougall explores the causes and effects of ice ages that have gripped our planet throughout its history, from the earliest known glaciation nearly three billion years ago to the present. Following the development of scientific ideas about these dramatic events, Macdougall traces the lives of many of the brilliant and intriguing characters who have contributed to the evolving understanding of how ice ages