A. there would be no change on Earth B. the atmosphere would be gradually stripped away C. the Earth would stop rotating D. all living things would die immediately 相关知识点: 试题来源: 解析 B。解析:如果地球磁场突然消失,大气层会逐渐被剥离。地球磁场消失会对地球产生巨大影响,A选项错误。地球...
Yet in the course of Earth history, the field has reversed multiple times, with substantial changes in both its direction and strength between reversals. These changes can only be studied via the geological record because of the long time scales on which they occur. New paleomagnetic records of...
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...
Google Share on Facebook geomagnetic (redirected fromEarth's magnetic field) Encyclopedia Wikipedia ge·o·mag·ne·tism (jē′ō-măg′nĭ-tĭz′əm) n. 1.The magnetism of the earth. 2.The study of the earth's magnetism.
Harmonic Analysis of the Earth's Gravitational Field from Kinematic CHAMP Orbits based on Numerically Derived Satellite Accelerations Based on very accurate kinematic CHAMP orbits, a new CHAMP gravitational field model was computed by means of a (point-wise) acceleration approach. In orde... T Reu...
The magnetic field is generated within the Earth by a fluid outer core of iron, nickel and other metals that creates electric currents, which in turn produce magnetic fields. The fact that it changes is well known, the reasons why have remained a mystery. ...
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...
Now, Noboru Ikeya and Jonathan Woodward at the University of Tokyo have shown that a magnetic field causes chemical changes that can affect cellular behaviour. They achieved this with the aid of a cellular chemical that fluoresces depending on the external magnetic field. When they waved a magne...
1(A) There are some Earth phenomen a you can count on,but the magnetic field,someday is not one of them. It fluctuates in strength,drifts from its axis, and every few 100,000 years, undergoes dramatic polarity reversal- a period when North Pole becomes South Pole and South Pole becomes...
Field measurements are now made from ships, aeroplanes and satellites as well as on the ground. For older records of the geomagnetic field and its changes with time we must turn away from historical documents to the study of the fossil magnetism in the Earth's rocks and sediments. The ...