How many earthquakes occur each day around the globe?

The United States Geological Survey estimates that there are around 50 earthquakes per day in the world that can be located. This amounts to around 20,000 earthquakes annually. Many earthquakes are undetected by the USGS; in fact, the organization estimates that around several million earthquakes occur around the globe annually.

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i believe the answer is a.

the product of the pressure and volume is also constant