A. begun to change in the opposite direction B. been weakening in strength for a long time C. caused the changes on the polarities D. misguided many a man and animal 相关知识点: 试题来源: 解析 B 正确答案:B 解析:文章第一段:《纽约时报》上周报道地球磁场严重减弱开始于150年前。磁场保护...
begun to Change to it’s opposite direction C. caused the changes on the polarities D. been weakening it’s strength for a long time 相关知识点: 试题来源: 解析 B 正确答案:B解析:本题考查考生的理解能力,根据原文内容“During a reversal,the main field weakens, almost vanish-es,and re...
GP President-Elect Ron Merrill has appointed a steering committee to develop a new initiative for a program to study the earth's magnetic field. In addition to Merrill, who will serve as chair, and Kenneth Verosub (University of California, Davis) who will be vice-chair, the committee ...
Faunal Extinctions and Reversals of the Earth's Magnetic Field A study of 28 deep-sea piston cores from high and low latitudes shows that during the last 2.5 m.y. eight species of Radiolaria became extinct. Prior to th... JAMES,D,HAYS - 《Geological Society of America Bulletin》 被引量...
According to the passage, the Earth’s magnetic field has ___. A.begun to change in the opposite directionB.been weakening in strength for a long timeC.caused the changes on the polaritiesD.misguided many a man and animal 相关知识点: 试题来源...
Sharks use the Earth's magnetic field (磁场) as a sort of natural GPS toDr Keller said further study was needed to find how the sharks used thenavigate(导航) journeys that take them great distances across the world'smagnetic fields to determine their location and whether larger, long-distanc...
Small magnetic grains in rocks will orient themselves to be parallel to the direction of the magnetic field pointing towards the north pole. (b) The geomagnetic polarity time scale shows how the polarity of the earth’s magnetic field has changed through time. Black bands indicate times of ...
Thats compared to 50 microteslas here on Earth. At present themoon does nothave a global magnetic field.Benjamin Weiss, the co-author of the new study, says, "Earth's magnetic field is currently 50microteslasin strength. The early moon may have had a magnetic field that was bigger maybe ...
2006Friis-Christensen E,Luhr H,Hulot G.Swarm:A constellation to study the Earth's magnetic field. Earth Planets Space,2006,58:351-358... E Friis-Christensen,H Lühr,G Hulot - 《Earth Planets & Space》 被引量: 366发表: 2006年 Earth Planets Space, 58, 429–437, 2006 Ocean circulation...
Preface The observation of the Earth's magnetic field is destined to play a crucial role in understanding the Earth system. The great potential of ground magnetic observations allows an impressive coverage of a diverse range of topics in the modern "magnetic world", in particular (i) development...