USGS United States Topographic Maps

U.S. Geological Survey

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The USGS is the Nation's largest water, earth, and biological science and civilian mapping agency. We provide science about natural resource …

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常见问题解答

问:
Can you predict earthquakes?
答:
No. Neither the USGS nor any other scientists have ever predicted a major earthquake. We do not know how, and we do not expect to know how any...
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