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If you splashed down in the Atlantic, you'd flounder on which way to swim. But a hatchling loggerhead turtle would know just where to paddleby reading the Earth's magnetic field. Scientists knew turtles can pinpoint latitude this way, because the fie
Scientific American(二)月
Tornados are one of the most frightening weather phenomena on our planet. Not only are they unique in how they form, but also in how they are measured . A tornados intensity is defined by the Enhanced Fujita Scale. On this scale, the intensity of the
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科学家研究地球磁场 WASHINGTON Most of us hardly ever think about the Earth's magnetic field. We might be aware that it helps guide birds as they migrate and ensures that our compasses point north, but not realize that it is one of the crucia
VOA标准英语2015年(十二月)
As the reversal approaches, the decay of our magnetic field will continue and cosmic radiation will get increasingly close to the Earth's surface. As the reversal approaches, the decay of our magnetic field will continue and cosmic radiation will get
自然百科2011年
It's clear from the fact that the Martian crust is strongly magnetized, that there must have been a magnetic field on Mars in the past, that the only way we know to magnetize rocks is for them to form in the presence of magnetic field. Why did Mars l
自然百科2011年
One of the world's most remote inhabited islands is on the lookout for a new farmer, but with just one village and a population of only 265 people moving there may not be everyone's cup of tea. 最近，世界上最偏僻的小岛之一正忙着招一位
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