According to the US Geological Survey (USGS), there are about 500,000 earthquakes in the world every year. Seismologists say that only 20 percent of these earthquakes are felt by humans and that
According to the US Geological Survey (USGS), there are about 500,000 earthquakes in the world every year. Seismologists say that only 20 percent of these earthquakes are felt by humans and that
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