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National Geographic news
8 个月
Earth's Interior
Instead, scientists map the interior by watching how seismic waves from earthquakes are bent, reflected, sped up, or delayed by the various layers.
AOL
5 天
What causes earthquakes? The science behind why seismic events happen
Earthquakes occur when two plates suddenly slip past each other, setting off seismic waves that cause the planet's surface to shake, according to the USGS. What is an earthquake, scientifically ...
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