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...
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...
The Earth's magnetic field is generated in the fluid region deep inside the Earth. Heat convection, buoyancy forces and planetary rotation cause the iron-rich fluid in the outer core to flow in a complex way and the movement of this electrical conductor through existing magnetic field generates...
(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. ge′o·mag·net′ic(-nĕt′ĭk)adj. ...
S Macmillan,MJ Rycroft 摘要: Scientists have been measuring the Earth's magnetic field for several centuries. They have built up an increasingly more detailed worldwide picture of the field and its variation with time. Field measurements are now made from ships, aeroplanes and satellites as well...
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...
The Earth's magnetic field is generated mainly by _. A. the movement of the outer core B. the rotation of the crust C. the presence of water on the surface D. the heat from the sun 相关知识点: 试题来源: 解析 A。解析:地球的磁场主要是由外地核中液态金属的流动产生的。地壳的旋转与...
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...
C.the magnetic strength of the Earth will disappearD.the magnetic strength of the Earth will be stronger 相关知识点: 试题来源: 解析 B 第三段第四句开始:磁场的转换给人类和动物带来许多问题。宇航员和卫星会遇到很多困难,依靠磁场指示方向迁徙的鸟类、鱼类和其他动物会在迁徙中失去方向。
The magnetic field of the Earth has global meaning for a life on the Earth. The world geophysical science explains: - occurrence of a magnetic field of the Earth it is transformation of kinetic energy of movements of the fused iron in the liquid core of Earth - into the magnetic energy; ...