The Northern Lights
The solar wind constantly streams toward the Earth, but dont worry because a protective magnetic fields surrounds our planet. The same magnetic field that makes your compass point north also steers the particles from the Sun to the north and south poles. The charged particles become trapped in magnetic belts around the Earth. When a large blast of solar wind crashes into the Earths magnetic field first gets squeezed and then the magnetic field lines break and reconnect.
Watching auroras is fun and exciting, but normally you can only see them in places far north like Alaska and Canada. The movement of the aurora across the sky is usually slow enough to easily follow with your eyes but they can also pulsate, flicker, or even move like waves. During solar maximum, auroras are seen as far south as Florida, even Mexico!
We hope you are able to travel to far-north places like the Arctic Circle and see the Northern Lights at least once during your lifetime. We know you will never forget it!
A. right B. wrong C. not mentioned
A. right B. wrong C. not mentioned
A. right B. wrong C. not mentioned
A. right B. wrong C. not mentioned
A. right B. wrong C. not mentioned
A. right B. wrong C. not mentioned
A. right B. wrong C. not mentioned
gre词汇回顾No题填空题词表B
新GRE阅读词汇的考察
gre词汇回顾No题类比反义词I
gre词汇回顾No题类比反义词C
Gre六选二近义词词汇总结6
gre词汇回顾No题填空题词表O
gre词汇回顾No题类比反义词U
gre考试复习同义词的重要性
gre词汇回顾No题类比反义词J
gre词汇回顾No题类比反义词H
新gre词汇类反取消难度不减
gre词汇回顾No题填空题词表U
gre词汇回顾No题类比反义词S
gre词汇回顾No题填空题词表E
“8字”原则备考新gre单词:“四大”总结
gre考试机考新词考察-m
备考gre考试单词如何背诵
gre词汇回顾No题类比反义词R
gre考试机考新词考察-s
gre词汇回顾No题填空题词表F
gre词汇回顾No题填空题词表I-K
gre词汇回顾No题填空题词表S
新旧gre考试对单词考察方式的不同
新版gre考试抓住“re”规律记gre词汇
备考gre考试词汇3个阶段(part1)
gre词汇回顾No题类比反义词A
gre考试词汇考察2大缘由
gre考试常见专业名词汇总(中)
新版gre考试抓住"fa"规律记gre词汇
gre词汇回顾No题填空题词表C
不限 |
英语教案 |
英语课件 |
英语试题 |
不限 |
不限 |
上册 |
下册 |
不限 |