Be A Volcanologist

Author: Suzy Gazlay
Publisher: Gareth Stevens
ISBN: 9780836889307
Size: 29.77 MB
Format: PDF, Mobi
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Be A Volcanologist. Provides facts and challenge questions about volanoes, eruptions, lava, and the work done by volcanologists.


Author: Jayne Keedle
Publisher: Gareth Stevens
ISBN: 9780836891553
Size: 42.52 MB
Format: PDF, ePub
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Volcanoes. Explores the most powerful and unforgettable volcanic events.

The Mass Extinction Debates

Author: William Glen
Publisher: Stanford University Press
ISBN: 0804722862
Size: 59.91 MB
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The Mass Extinction Debates. This book examines the arguments and behavior of the scientists who have been locked in conflict over two competing theories to explain why, 65 million years ago, most life on earth—including the dinosaurs—perished.


Author: Gerrit L. Verschuur
Publisher: Oxford University Press
ISBN: 019028370X
Size: 33.90 MB
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Impact . Most scientists now agree that some sixty-five million years ago, an immense comet slammed into the Yucatan, detonating a blast twenty million times more powerful than the largest hydrogen bomb, punching a hole ten miles deep in the earth. Trillions of tons of rock were vaporized and launched into the atmosphere. For a thousand miles in all directions, vegetation burst into flames. There were tremendous blast waves, searing winds, showers of molten matter from the sky, earthquakes, and a terrible darkness that cut out sunlight for a year, enveloping the planet in freezing cold. Thousands of species of plants and animals were obliterated, including the dinosaurs, some of which may have become extinct in a matter of hours. In Impact, Gerrit L. Verschuur offers an eye-opening look at such catastrophic collisions with our planet. Perhaps more important, he paints an unsettling portrait of the possibility of new collisions with earth, exploring potential threats to our planet and describing what scientists are doing right now to prepare for this awful possibility. Every day something from space hits our planet, Verschuur reveals. In fact, about 10,000 tons of space debris fall to earth every year, mostly in meteoric form. The author recounts spectacular recent sightings, such as over Allende, Mexico, in 1969, when a fireball showered the region with four tons of fragments, and the twenty-six pound meteor that went through the trunk of a red Chevy Malibu in Peekskill, New York, in 1992 (the meteor was subsequently sold for $69,000 and the car itself fetched $10,000). But meteors are not the greatest threat to life on earth, the author points out. The major threats are asteroids and comets. The reader discovers that astronomers have located some 350 NEAs ("Near Earth Asteroids"), objects whose orbits cross the orbit of the earth, the largest of which are 1627 Ivar (6 kilometers wide) and 1580 Betula (8 kilometers). Indeed, we learn that in 1989, a bus-sized asteroid called Asclepius missed our planet by 650,000 kilometers (a mere six hours), and that in 1994 a sixty-foot object passed within 180,000 kilometers, half the distance to the moon. Comets, of course, are even more deadly. Verschuur provides a gripping description of the small comet that exploded in the atmosphere above the Tunguska River valley in Siberia, in 1908, in a blinding flash visible for several thousand miles (every tree within sixty miles of ground zero was flattened). He discusses Comet Swift-Tuttle--"the most dangerous object in the solar system"--a comet far larger than the one that killed off the dinosaurs, due to pass through earth's orbit in the year 2126. And he recounts the collision of Comet Shoemaker-Levy 9 with Jupiter in 1994, as some twenty cometary fragments struck the giant planet over the course of several days, casting titanic plumes out into space (when Fragment G hit, it outshone the planet on the infrared band, and left a dark area at the impact site larger than the Great Red Spot). In addition, the author describes the efforts of Spacewatch and other groups to locate NEAs, and evaluates the idea that comet and asteroid impacts have been an underrated factor in the evolution of life on earth. Astronomer Herbert Howe observed in 1897: "While there are not definite data to reason from, it is believed that an encounter with the nucleus of one of the largest comets is not to be desired." As Verschuur shows in Impact, we now have substantial data with which to support Howe's tongue-in-cheek remark. Whether discussing monumental tsunamis or the innumerable comets in the Solar System, this book will enthrall anyone curious about outer space, remarkable natural phenomenon, or the future of the planet earth.

Trick Or Truth

Author: Anthony Aguirre
Publisher: Springer
ISBN: 3319274953
Size: 64.82 MB
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Trick Or Truth . The prize-winning essays in this book address the fascinating but sometimes uncomfortable relationship between physics and mathematics. Is mathematics merely another natural science? Or is it the result of human creativity? Does physics simply wear mathematics like a costume, or is math the lifeblood of physical reality? The nineteen wide-ranging, highly imaginative and often entertaining essays are enhanced versions of the prize-winning entries to the FQXi essay competition “Trick or Truth”, which attracted over 200 submissions. The Foundational Questions Institute, FQXi, catalyzes, supports, and disseminates research on questions at the foundations of physics and cosmology, particularly new frontiers and innovative ideas integral to a deep understanding of reality, but unlikely to be supported by conventional funding sources.

Science On The Internet

Author: Jazlin V. Ebenezer
Publisher: Prentice Hall
Size: 32.49 MB
Format: PDF, ePub, Mobi
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Science On The Internet. The Internet holds great potential for augmenting traditional sources of science information for elementary, middle, and high school classes. But how can teachers mine that information lode effectively, appropriately, and easily? With the second edition of this handy, helpful book. Here is everything science teachers could want to know about finding reliable science websites on the Internet, using the Internet to create hands-on science activities, and building a science curriculum based on Internet resources. For present and future elementary school science teachers who want to achieve Internet literacy themselves and their students.

Makers Of Science

Author: Michael Allaby
Publisher: Oxford University Press, USA
ISBN: 9780195216806
Size: 65.57 MB
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Makers Of Science. Includes biographies of the most influential scientists and thinkers, from Aristotle and Galileo to Isaac Newton and Antoine Lavoisier.