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...
My mother’s parents came from Hungary, but my grandfather could trace his origin to Germany and also he was educated in Germany. Although he was able to hold a conversation in nine languages, he was most comfortable in German. Every morning, before going to his office, he read tile ...
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...
Parameters of the Earth's magnetic field observed near the surface of the planet vary in space and time over wide ranges. As well as processes acting in the deep interior of Earth, the crust, the ionosphere, the magnetosphere, and the Sun all contribute to the observed magnetic field. ...
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 reappears with opposite polarity.”在反向运转时,主要的磁场就会减弱,几乎彻底消失,甚至重新出现相反的磁极。根据这句话可以知道,地球磁场开始向它的反方向改变,所以B比较符合题意。
This is because the magnetic field(磁场) of the Earth "protects" us from the "wind".At the North and South Poles, however, some particles may get in and meet with the Earth's air. Then, the particles get "excited" and have a "dance" with the air. So, we can see the moving ...
百度试题 结果1 题目Pigeons navigate less accurately when the earth’s magnetic field is ___. A. discovered B. dissuaded C. disturbed D. distracted 相关知识点: 试题来源: 解析 to check 反馈 收藏
百度试题 结果1 题目S_(▱BDOE)=alsO对……产生影响)theearth'smagnetic field. 相关知识点: 试题来源: 解析 1. have effects on/have an effect on句意:太阳黑子对于地球磁场有影响。 反馈 收藏
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...
As the field originates in the Earth's molten core, the palaeomagnetic record is crucial to the understanding of both the origin and evolution of the geomagnetic field and the Earth's deep interior. 展开 关键词: geomagnetism geomagnetic observations spatial and temporal variations magnetic activity...