Cncei NOAA

National Environmental

Asheville, 美国 中的 研究机构
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The National Environmental Satellite, Data, and Information Service, provides secure and timely access to global environmental data and …

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问:
What is Earth's magnetic field?
答:
Earth acts like a large spherical magnet: it is surrounded by a magnetic field that changes with time and location.The field is generated by several sources inside and outside...
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