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 vanishes,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 ...
WASHINGTON, April 30 (Xinhua) -- An international team of researchers has found that the reversal of the Earth's magnetic field is unlikely to take place anytime soon, according to a study published Monday in the Proceedings of the National Academy of Sciences. It came after speculation that ...
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...
Thus the history of the geomagnetic field is intimately co... PL Mcfadden,RT Merrill - 《Journal of Geophysical Research Solid Earth》 被引量: 83发表: 1995年 Faunal Extinctions and Reversals of the Earth's Magnetic Field A study of 28 deep-sea piston cores from high and low latitudes ...
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...
摘要原文 Our aim in this proposal is by using the Faraday's law of induction as a simple lecture demonstration to measure the Earth's magnetic field (B). This will also enable the students to learn about how electric power is generated from the rotational motion. Obviously the idea is not...
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 upto more than 70 microteslas.Weiss and Sonia ...
Professor: Uh, let’s start with solar activity and its interactions with earth magnetic field.See the sun as you know, on the sun you have constant activity, like explosions and plasma, the sun’s matter just sort of seething all the time.The explosions from the sun they blow tons of ...