North Pole, South Pole

North Pole, South Pole❴EPUB❵ ✵ North Pole, South Pole Author Gillian Turner – Why do compass needles point north—but not uite north What guides the migration of birds whales and fish across the world’s oceans How is Earth able to sustain life under an onslaught of solar win Why do compass needles point north—but not uite north What guides the migration of birds whales and fish across the world’s oceans How is Earth able to sustain life under an onslaught of solar wind North Pole, Epub / and cosmic radiation For centuries the world’s great scientists have grappled with these uestions all rooted in the same phenomenon—Earth’s magnetismOver years after the invention of the compass Einstein called the source of Earth’s magnetic field one of greatest unsolved mysteries of physics Here for the first time is the complete history of the uest to understand Earth’s magnetism—from the ancient Greeks’ fascination with lodestone to the geological discovery that the North Pole has not always been in the North—and to the astonishing modern conclusions that finally revealed the true sourceRichly illustrated and skillfully told North Pole South Pole unfolds the human story behind the science that of the inuisitive persevering and often dissenting thinkers who unlocked the secrets at our planet’s core. A kind of book I love which takes a body of knowledge that most of us experience as a bare statement of fact in our education the Earth has a magnetic field that explains how compasses work and protects from radiation from outer space and by the way it has flipped end for end multiple times in the distant past and lays out a detailed history of how we learned about it and how much we have left to learn Enlightening and entertaining Great example of interesting science and history combined into a compelling story I really enjoy books about science and particularly ones that give an historical perspective to our ongoing discovery of scientific knowledgeOn the subject of the Earth's magnetism I have to say that I was almost totally ignorant I know that the Earth has magnetic poles but that was basically the extent of my knowledge and I am ashamed to say that it had never occured to me to wonder why the Earth should be magnetic I had no idea that the entire Earth is covered in a magnetic field that protects us from solar winds and cosmic ray particles Without this protective magnetic field the Earth would be an uninhabitable planetGillian Turner is a British geophysicist who works at Victoria University Wellington New Zealand She describes this book as the history of a scientific uest that has spanned several millenia That uest was the drive to solve the problem of Earth's magnetism why is the Earth magnetic? Is the magnetism generated internally or externally? And most puzzling of all how is the magnetism sustained?The journey to understand this problem begins in 900BC with the Greek legend of the shepherd Magnes who went out to tend his sheep the morning after an electrical storm and found that his iron studded boots stuck to the rocks This was the first type of magnetism that was identified by humans the local magnetisation of rock that is rich in magnetite an oxide of iron after it has been struck by lightning This rock is known as lodestoneThe interest in magnetisation really took off with the development of the compass and it's importance to ocean navigation Why did the compass needle always point north but not directly to the geographical north pole? Why did the variation between magnetic north and true north change from place to place across the globe? Why did the needle dip up and down at different degrees depending on latitude? The uest to answer all these uestions involved some of the greatest scientific minds and intersected with scientific discoveries regarding the calculation of longitude the discovery of electricity and the development of geology Scientists playing a major role in this story include Halley Gauss Ampere Faraday Coulomb Clerk Maxwell and many The final chapters in this uest for understanding are still to be written Major breakthroughs in understanding the magnetism of the Earth have only become possible within the last 20 years Prior to that we did not have the supercomputers necessary to undertake the immense mathematical calculations needed to solve the euations that would explain the magnetic processes taking place within the EarthI have to admit that a lot of the science in this book was way over my head but I still got a lot out of it I learnt a huge amount and I really enjoyed reading about all the scientists involved in solving this puzzle and as always I found myself totally fascinated by the way in which scientific knowledge grows and feeds off itself in a cascading domino effectThe only thing I would have liked of in this book would have been some discussion of the effects on life on Earth of such things as shifting magnetic polarities and the changing strength of the Earth's magnetic field On the very last page Gillian Turner provides us with the tantalising information that in the past 200 years the Earth's magnetic field has dropped by 15% an astonishing rate of change What does this mean? If a weaker magnetic field means less protection from solar winds and cosmic rays could this explain things like climate change and the hole in the ozone layer? I really wish there could have been some discussion of things like this but perhaps this historical account is not the right place for issues like that Maybe Gillian Turner will write another book that tackles these uestions Although I knew most of the basic science regarding earth's magnetism from various other readings this book tied everything together chronologically and in much detail In fact after finishing it I added it to my History bookshelf as well as the Science shelf because it is so much about the various individuals that have contributed to our knowledge of magnetism since the beginning of the current epochI struggled between whether to give it three or four stars There are sections that were fascinating and deserved the higher rating but overall the book did not hook me as much as I would have liked It's difficult to say why At times some of the math or theoretical concepts were a little vague and for me could have used explanation examples or analogies At other times it just moved a little slower than I would likeSince plate tectonics is an area of special interest for me I especially enjoyed the section on how the discovery of sea floor spreading and alternating bands of oppositely polarized rock contributed to the proof of the plate tectonic theory of continental driftI think if I were a student of geomagnetism looking for an overview of the history of the science I might have given the book the higher rating This reviewer knows precious little about geophysics so will not be complaining as others have that this book was directed at a generalist audience I will complain however about the back cover I realize this is out of the control of the author and the blame rests with the publisher but it is a pet peeve of mine when cover descriptions do not match the contents of the book Here the back cover uestions how birds and other animals navigate by magnetism yet the book does not deal with this topic at all aside from a brief mention of the topic in the epilog Nor should this book deal with that topicIt felt overstated for me in my supreme ignorance for the book to claim that certain mysteries have been solved Indeed theories have been proposed and are evolving Very little has been solved At best we might claim that the answers have been hinted at Very good could've been greatThis rather exhaustive review of the study of planetary magnetism is scholarly and worth reading It contains just over 20% tables definitions and cast of characters lists that are largely unneeded The author does a than adeuate job of describing and introducing all elements within the text For me it is just fluff used to plump up the book to a respectable size The author's passion for the subject is very apparent but is in some ways given less impact than a different editor may have been able to draw out The subject is interesting the science still somewhat incomplete the scientists involved are complicated characters in their own rightsI paid full retail for this book and feel well compensated for my toils to earn the opportunity to read it I have and will recommend this book to many curious friends and acuaintances The subtitle “Epic uest” misled me to expect adventure and less mathematics I found some of the chapters difficult to comprehend as a general science reader The part I enjoyed most was about the early scientists and the beginnings of the Royal Society of London in 1660 There are excellent illustrations throughout which helped with some of the concepts that were new to me I wish I wrote this Fantastic insightful rewarding accurate description of a fundamental part of life on earth It illustrates the life and importance of science like no other book Mostly had to lower stars because I did not understand so much of the physics and stuff I was hoping for a little bit less academic and a little popular science I really enjoyed the historical side of it This book was interesting but at times became a little overly technical at times I had a difficult time keeping straight the difference between inclination and declination for example

North Pole, South Pole PDF Û North Pole,  Epub /
  • Paperback
  • 288 pages
  • North Pole, South Pole
  • Gillian Turner
  • English
  • 07 April 2016
  • 9781615190317