根据原文内容填空磁场The earth's magnetic field(磁场) exists everywhere in our life, but we cannot see, feel, hear or touch. Deep in the earth, there is a very hot liquid(液体). As it moves around, it develops magnetism. It surrounds the earth with a powerful magnetic field. If the ...
The study of the Earth's magnetic field is one of the oldest scientific disciplines. Research in geomagnetism enabled information to be deduced about the Earth's interior, the electrodynamics of the upper atmosphere at altitudes above 100 km, and the processes at work in interplanetary space and...
The earth has a magnetic field. What does the magnetic field do? A. Makes the earth spin B. Attracts iron and steel C. Makes the sun shine D. Helps plants grow 相关知识点: 试题来源: 解析 B。本题考查对地球磁场作用的了解,地球磁场能吸引铁和钢。A 选项地球自转不是磁场的作用;C 选项...
这个过程被称为“电磁感应”,是地球磁场形成的核心机制。 地球磁场的结构 (Structure of the Earth's Magnetic Field) 地球的磁场并不是均匀的,而是具有复杂的结构。地球的磁场可以用磁力线来表示,这些磁力线从地球的南极延伸到北极,形成一个类似于巨大的磁铁的形状。 磁场的强度 (Strength of the Magnetic Field) ...
The origin of the Earth''s magnetic field is one of the oldest problems in physics. The fact that the field is now known to have reversed its polarity many times in the past has given added interest to the problem. This paper discusses these issues and describes briefly the physical ...
A. and B. but C. or D. so 相关知识点: 试题来源: 解析 D。“The earth has a magnetic field”(地球有磁场),“it can protect us from harmful solar radiation”(它可以保护我们免受有害的太阳辐射),前后为因果关系,所以用 so。反馈 收藏 ...
THE, precise constitution of the earth's magnetic field at any one time, and the causes of the constituent fields, are problems of fascinating interest, the solution of which appears destined' to reveal hitherto unknown properties of matter. A most intimate knowledge of the earth's magnetic ...
the earth's magnetic field requires the specification of three elements for a complete statement of its magnitude and direction at an point .a commom combination comprises the vertical component .z,the horizontal component .h ,and the declination. d, which is the angle between the direction of...
IT is generally agreed that the Earth's principal magnetic field arises from a dynamo action in the fluid and electrically conducting core, although the origin of motions in the core is still a matter for speculation. Only two mechanisms seem to be possible-thermal convection in the core or ...
As early as 1971, creation scientist Dr Thomas Barnes, then Professor of Physics at The University of Texas at El Paso, drew fresh attention to the fact that the strength of the earth’s magnetic field was decreasing.1 He noted that between 1835 and 1965 geophysicists had made some 26 ...